Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b63443766fd2c7…

MALICIOUS

PDF

59.1 KB Created: 2020-08-06 13:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e7618dc769fbdc29dbdb73e8321f316 SHA-1: 59bbab36f7e2702047e1c3a14f040a1536e93341 SHA-256: 63b63443766fd2c7e87161f5a129ffbc0e9cb344c611ea3cd972f744c5251ad9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=kazuo+inamori+books+pdf
    • http://files.didsburyjuniors.com/uploads/1/3/2/6/132681824/maxipupamekep.pdf
    • http://suvisoner.edensires.com/uploads/1/3/1/6/131606349/wazakovawu_komoke.pdf
    • http://files.campme.org/uploads/1/3/0/8/130813799/dapusa.pdf
    • http://files.calzadoleonsr.net/uploads/1/3/1/3/131384679/xerut_xovup_riranazotuluvu_pedalikewif.pdf
    • http://files.imajicatheatrecompany.co.uk/uploads/1/3/0/7/130775229/xavabelufizudamowope.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/70875610599.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/tunit.pdf
    • https://cdn.shopify.com/s/files/1/0436/2502/1603/files/topix_livermore_ky.pdf
    • https://cdn.shopify.com/s/files/1/0431/1891/9837/files/46617551192.pdf
    • https://cdn.shopify.com/s/files/1/0429/1585/6550/files/8931067117.pdf
    • https://cdn.shopify.com/s/files/1/0449/4766/9160/files/massey_harris_44.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2613/files/nadovetelepame.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2061/files/punctuation_passage_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/0916/2907/files/50470900043.pdf
    • https://cdn.shopify.com/s/files/1/0444/4487/6966/files/infinity_in_greek_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/buragegewak.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/
    • http://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000097ac.bin
409d8941d0fee033f52a1560abb49b4e0790a2fead8fadfd4f16c5fdb5087c6e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x97AC 7084 bytes
font_00_sfnt_off00005e86.bin
0c53f0863e412bba418585ca1fd6d8ff8e35b06dc8d4b9ad84e517f73520fa45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E86 12276 bytes
font_01_sfnt_off000086b2.bin
67fabcabfd05f92130bd4357ff7a52296ee44d30f246a5dafc4a0f3163a8e6b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B2 5060 bytes
font_03_sfnt_off0000aa76.bin
92b3a5fda4e792f397dec715bd6974ab3ebb88c6b2c26a60625b2f88835b85f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA76 12488 bytes
font_04_sfnt_off0000d0b8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B8 4324 bytes

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