Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfd4a369d35d9a3…

MALICIOUS

PDF

36.8 KB Created: 2020-08-13 22:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0e897d259c8210bd1412900c634ce45 SHA-1: 2d85ec13e10816cf43af639c3b114f244fd8be67 SHA-256: 6dfd4a369d35d9a30d63aa47dfdffd54e3172b5ce104eb2346dd3d9484157c1e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to external PDF files, suggesting a link farm for SEO manipulation. One prominent URL, https://ttraff.ru/pify?keyword=uc+browser+old+version+2016+free, is flagged as malicious and appears to be the primary lure. The document body, though heavily obfuscated, contains references to this URL and the 'uc browser old version' keyword, reinforcing the phishing pretext. The ML classifier strongly indicates 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/pify?keyword=uc+browser+old+version+2016+free
    • http://ruwurazu.jillhakala.com/uploads/1/3/1/4/131438137/275fdff66b7e.pdf
    • http://files.key2evolve.com/uploads/1/3/0/8/130874318/zasabuxemer_xawapikiguromik_balasoge.pdf
    • http://files.easybasicphotography.com/uploads/1/3/1/6/131637114/f2472fefb3c.pdf
    • http://files.themaverickofficial.com/uploads/1/3/1/6/131606486/7046445.pdf
    • http://files.russcarlton.com/uploads/1/3/1/4/131453214/c6f6eb4dafc8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8348/0736/files/85386483536.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/4600576293.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/samodibubuxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/case_study_on_accounts_receivable_management.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/76300997238.pdf
    • https://cdn.shopify.com/s/files/1/0432/1155/4980/files/pituze.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/jelovuradimuritusixete.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2629/files/27544603432.pdf
    • https://cdn.shopify.com/s/files/1/0432/0516/5216/files/xekowozibazovav.pdf
    • https://cdn.shopify.com/s/files/1/0431/4588/7905/files/wunetuki.pdf
    • https://cdn.shopify.com/s/files/1/0438/6576/8096/files/24175311822.pdf
    • https://cdn.shopify.com/s/files/1/0434/4135/6950/files/44636009796.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9066/files/20800199274.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_off00004c54.bin
8d14a1d94ca93115807b61d62291a766535e12220c9267551dfc3c4c0cfcb23b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C54 5568 bytes
font_01_sfnt_off00005f70.bin
fff066331b20c90b43faecdd68bee6d10699d1ec90390c1315f434fe845af308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F70 12368 bytes

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