Malicious PDF — malware analysis report

Static analysis result for SHA-256 811bb6a44ad1420a…

MALICIOUS

PDF

42.5 KB Created: 2020-08-06 05:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5aed914b9e29978fdcaebf221c36e25c SHA-1: d01e7fd881646bbd254226faaa97dd3034c9a277 SHA-256: 811bb6a44ad1420a1b85fa799c350267eacb08f60b6361629965780101d640fc
154 Risk Score

Malware Insights

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

The PDF contains a deceptive lure for a free PDF converter, directing users to a malicious redirector URL. The embedded links and the document body text strongly suggest a phishing or scam attempt, likely to lead users to download malware or visit further malicious sites. The ML classifier also flagged this PDF with high confidence.

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.com/pify?keyword=pdf+converter+to+word+free+download+for+windows+7
    • http://files.bellafurworks.com/uploads/1/3/1/8/131856381/duguvat.pdf
    • http://files.burnsidecenter.com/uploads/1/3/0/7/130740591/pamapepukab-gefuwaf-jufafililelok.pdf
    • http://files.fulloffaith.com/uploads/1/3/2/8/132815004/368394.pdf
    • http://veluvipur.wisecashsolutions.com/uploads/1/3/2/6/132681670/tajepefevabali-jiratabutevukam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6173/0719/files/jufeboxumepepisanuvapuwes.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/93059420958.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/nusatanatixosebimogizun.pdf
    • https://cdn.shopify.com/s/files/1/0433/9154/9590/files/59336406012.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/52922301544.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/sutolujilisibekegujo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9886/4804/files/18892197281.pdf
    • https://cdn.shopify.com/s/files/1/0429/2545/7574/files/77566862381.pdf
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/20533196416.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2384/files/ropavawiriwiruwususoxelun.pdf
    • https://cdn.shopify.com/s/files/1/0440/3786/5637/files/jonesabigorijojojilik.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/sapewaruv.pdf
    • https://cdn.shopify.com/s/files/1/0428/1748/7011/files/tokawakanibonuvezud.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_off000067af.bin
f12bd107ea70704f9ba98aeccfb3f5f705e6931f7fee8be6b8fd6e5be548db1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AF 5248 bytes
font_01_sfnt_off000079b7.bin
39105e90c391ff6b7c045067b9d30eed755167eb35656aa9ed1d62d6553f0159		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B7 10428 bytes

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