Malicious PDF — malware analysis report

Static analysis result for SHA-256 043f757b7963e4c4…

MALICIOUS

PDF

51.6 KB Created: 2020-08-12 15:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8c69d473f5e3e29d26e44c86b729322 SHA-1: b3e5d6fbde4649a575f5ee4d04c5bd2ee438f2b7 SHA-256: 043f757b7963e4c4c610c677bf4c54460371e4b761525d16c6c94a9f4ff58070
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service identified as malicious. The document body, though heavily obfuscated, also contains the malicious URL, suggesting an attempt to trick users into visiting potentially harmful 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=autocratic+and+democratic+leadership+styles+pdf
    • http://files.innovativetruth.org/uploads/1/3/1/1/131164442/975212.pdf
    • http://files.neiljohannsenart.com/uploads/1/3/0/8/130874380/9056561.pdf
    • http://dojaru.sanspointe.com/uploads/1/3/2/7/132710589/d4a82dfdf5a.pdf
    • http://files.lcpiano.studio/uploads/1/3/2/6/132681304/6823401.pdf
    • http://kaweg.highlandtigers.com/uploads/1/3/0/9/130969723/7d1d742e9127c5b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/newisasiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3571/files/zalugo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6962/6781/files/learn_japanese_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/6192/7318/files/73697610874.pdf
    • https://cdn.shopify.com/s/files/1/0429/1349/7247/files/anna_university_medical_fitness_certificate_format.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/bodobe.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/92027584013.pdf
    • https://cdn.shopify.com/s/files/1/0432/3688/4642/files/45813987593.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/xinizunirufenaboki.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5481/files/57516112417.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/the_psychology_of_love_sigmund_freud_download.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e76.bin
8c50b4e378b5daea0e2e1e0a9925c4115e40b5160fbd41c6c13a0b7a1b589506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E76 5368 bytes
font_01_sfnt_off0000908c.bin
d71a97fcd19e23cdb084b7f289f5b392ca4e405a0a947c3fec606309b3187155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x908C 10076 bytes
font_02_sfnt_off0000b2fd.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FD 4324 bytes

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