Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecf4781308909e6…

MALICIOUS

PDF

37.3 KB Created: 2020-08-12 08:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3c0382789bd16a2536a3b26332586ab SHA-1: 502ecc3f617c781877739bceeb777b5f0b539545 SHA-256: 3ecf4781308909e6bc9dfbbbaaa9a9db1061d50ffec471f1f3b0d0c561e15571
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, many of which point to external PDFs hosted on various domains, including a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Adobe lightroom 5 tutorial pdf' and a URL that appears to be part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://ttraff.ru/pify?keyword=adobe+lightroom+5+tutorial+pdf, which is flagged as a malicious redirector. The presence of a large number of external links and the redirection to a malicious URL strongly suggest a phishing or malware distribution attempt.

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=adobe+lightroom+5+tutorial+pdf
    • http://kozoxeb.rimcountrygoods.com/uploads/1/3/2/8/132814930/6744936.pdf
    • http://wanav.glencoutts.com/uploads/1/3/1/8/131856158/sizurezu_bufopo.pdf
    • http://files.archaiconlineshop.com/uploads/1/3/0/8/130874655/desupipelo.pdf
    • http://files.jasinthehatwithacat.com/uploads/1/3/1/0/131070588/jezivubodowapo_sajadit.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/28857312501.pdf
    • https://cdn.shopify.com/s/files/1/0434/6350/8121/files/tikoxegipedokixaguzutebaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/penn_dot_bulletin_15.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1278/files/94133154364.pdf
    • https://cdn.shopify.com/s/files/1/0437/1100/4821/files/kemibu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/2014_ford_escape_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0133/9304/files/29203687195.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8311/files/52643747498.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/mabinogi_tribolt_wand.pdf
    • https://cdn.shopify.com/s/files/1/0437/3889/0394/files/green_check_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/laboratory_equipment_list_and_their_uses.pdf
    • https://cdn.shopify.com/s/files/1/0437/1588/7256/files/vapigolaramirolewesibuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/37615911034.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_off000054be.bin
507d2420f851530c61a758f1127ad4f1990e7475143030a0153a8c0b0787957c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54BE 5528 bytes
font_01_sfnt_off0000676d.bin
92dc29359e42c9ed5a58434df83d7282e4c32c186654e816ad1121724c2a55a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676D 9568 bytes

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