Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64f1883662647f8…

MALICIOUS

PDF

33.7 KB Created: 2020-08-29 22:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e069377f9fbd3ad3d503e7aac3253eb SHA-1: 0125dcbad13154c7fc62cd99c80bc203ce763191 SHA-256: d64f1883662647f831aced64973eb7bfa4226ce4c271df1e893a297ecfea4d48
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The presence of a mass external PDF link farm suggests an attempt to manipulate search engine results or distribute malicious content. 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.ru/wix?keyword=cura+anet+a8
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/mejejigijuwopowajidapiza.pdf
    • https://cdn.shopify.com/s/files/1/0440/3740/6870/files/34800708838.pdf
    • https://cdn.shopify.com/s/files/1/0430/3909/6986/files/povipeliwuxirekifovomibe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2440/7961/files/37252627052.pdf
    • https://cdn.shopify.com/s/files/1/0437/7706/5121/files/vermintide_2_executioner_sword_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/comment_nouer_cravate.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/redibe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1101/files/jolonegidinipisisebo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/xupene.pdf
    • https://static.usrfiles.com/ugd/b8c837_912440e77ed84e83bf6efcd6eb7d9f54.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcc17a7272924eab8106535be1aeb6b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_81e8c549e290426da2139fed73d8dbea.pdf
    • https://static.usrfiles.com/ugd/b8c837_663a55f8981a44bc82b73d35778bb442.pdf
    • https://static.usrfiles.com/ugd/b8c837_0048c07d6de746819895bb2a129e6ea6.pdf
    • https://static.usrfiles.com/ugd/b8c837_da3724f3216541148d9ee4d495fea753.pdf
    • https://static.usrfiles.com/ugd/b8c837_d46dfc5edf7f4833a626abf19ee6e198.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004945.bin
d4bc09c6e869a09d74b43929f30b3a75d4a5742c81c161cf36dd5963ad8fc892
pdf-font-stream PDF embedded font (sfnt) at offset 0x4945 4568 bytes
font_01_sfnt_off000058cf.bin
6fd4e0f5ad96ed8c430b31073134e982a26112599bb513d64534169b61c193f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x58CF 9792 bytes