Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5fa94703882adb…

MALICIOUS

PDF

134.3 KB Created: 2020-07-28 21:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f5935a08f61d7c16d39f259dea7c580 SHA-1: 27323ad4af8c9e0878eea0389e34250f91bbfd77 SHA-256: 8e5fa94703882adb58d2b603fd893be55f1b475af24c43b8e95393dc3b0a39cc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9674

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=nicknames+of+countries+in+the+world+pdf
    • http://files.subseasales.com/uploads/1/3/1/4/131483719/pavevuzujewasad_dokixelusu_bujugubawowubum.pdf
    • http://files.onandofftheroadcreativeimages.com/uploads/1/3/1/1/131164538/larajobudisa.pdf
    • http://files.lcmasonry.com/uploads/1/3/2/3/132302716/9983175.pdf
    • http://files.cscdlab.com/uploads/1/3/0/7/130738792/vipokatug.pdf
    • http://files.southingtonjaycees.com/uploads/1/3/0/7/130776573/e18e0c.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/tudazuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/popigiwanubipam.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/54327173539.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8980/files/sufonis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/fufifumewej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30151397197.pdf
    • https://cdn.shopify.com/s/files/1/0434/3860/4450/files/57185490519.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/4174922937.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4476/files/85850676709.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jerozex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1402562920.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/pogoxugagamojuzokigev.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/fijikujaveme.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/47537553263.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/wuxejamakikezilog.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 11

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_011_off000166e6.bin
2bb9542f9a659fee6142e3ab5405e75e7f5ac680b5237dcfb1aea13f4ab9a24b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x166E6 2212 bytes
stream_015_off0001c4f8.bin
a21b98bd5406c1762402727ebaa3a9be2c7311da13530bde619bf3882245d6e0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C4F8 24648 bytes
font_00_sfnt_off0000e74a.bin
60c0a1f07e1249314a9a895aa2aad22f495862bdc185dd42c58ced1d083e30f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 16380 bytes
font_01_sfnt_off00011bc9.bin
d8ba9a7e68cc20cc1714d4ebf123b32b677d663738c6c0a37efeafe1c2206126		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 5400 bytes
font_02_sfnt_off00012e03.bin
ef39ea26f3d10abe8cc4eb3820d3416a32b6202ffb45dfe49ae1c523df8c18f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E03 6848 bytes
font_03_sfnt_off000142b4.bin
aa4fe8d34eb0ab54731c6cb8014ebeffd1809fa69666df9975e487aa80a698ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142B4 7684 bytes
font_04_sfnt_off00015bd8.bin
36dee6991d9f0e33baffde5bc4731461384faf2ca93785449698483b660337a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD8 2832 bytes
font_06_sfnt_off00017148.bin
4ba7ad19ea25966ce1f426393f0bfa7fde8cbf2f83028303b41a289fa18a5ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17148 2844 bytes
font_07_sfnt_off00017d83.bin
88a2156805128f986811107b437d3244b49cfe390fc759cac5d9b69b9e6f7503		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D83 8604 bytes
font_08_sfnt_off0001954a.bin
9bbe6aafb9d5e5c606c1b50de5137c2b2324ab940ee05108bb42bab1e0ae5065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1954A 16496 bytes
font_10_sfnt_off0001f422.bin
f378b1d6cd50fb1811d25d616df67060a4afa679d84aece7149fcb22aaff34c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F422 5148 bytes

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