Malicious PDF — malware analysis report

Static analysis result for SHA-256 1678aaba106563f4…

MALICIOUS

PDF

43.7 KB Created: 2020-08-08 23:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b27ae1a51787883297596e192f45eef6 SHA-1: 24c32a2f6725ceef08843bf360e7fad0728ac5fa SHA-256: 1678aaba106563f4953b82def68fb8a25c59dbf1052f34258abc1336d63ff2b2
154 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector suggests an attempt to lure users to malicious content. No scripts were extracted, but the primary attack vector appears to be the embedded malicious link.

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.ru/pify?keyword=le+liquide+c%25C3%25A9phalo+rachidien+pdf
    • http://files.maddysmusicstudio.com/uploads/1/3/1/4/131484029/6814521.pdf
    • http://files.maymoqiuma.com/uploads/1/3/1/4/131407138/rudumo_sinojivik.pdf
    • http://files.joellecreates.com/uploads/1/3/2/6/132682655/0489dea60de8d.pdf
    • http://files.roamingbrit.com/uploads/1/3/0/8/130874474/bezatarorib_robuzudivevi_fuvam_nuvadofafavipu.pdf
    • http://zuruligax.shelleypearsonwrites.com/uploads/1/3/2/6/132695663/rojafexozele_merupomejamojak_pozilenided_wijenekozef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4769/7049/files/32444563089.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/11635794808.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/wemuzixisiwafa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/morisky_medication_adherence_scale_8_item.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31906594002.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/97711064570.pdf
    • https://cdn.shopify.com/s/files/1/0448/0519/3885/files/boy_baby_names_hindu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/wenalu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vabagibad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70838758317.pdf
    • https://cdn.shopify.com/s/files/1/0440/6624/2710/files/tomebolibumavonaketotev.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/kefumidajemewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8988/files/pemiwovepepobob.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068bb.bin
39df9aec2b6437cc55754d7dad8de45aa01694529931d56ba17b36a8670ca196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BB 5276 bytes
font_01_sfnt_off00007a64.bin
4d2a4e3aba09b5a1ada7aaaedcf1adfd4487cee9efd35ab3c0d6118168de1aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A64 11884 bytes

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