Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa873d5aaa99abc…

MALICIOUS

PDF

49.4 KB Created: 2020-08-02 22:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5d5e416fe01b204b831f9871552e8cc SHA-1: 0e4f6afdbb31e816278699d3055facb58a26b95c SHA-256: 0fa873d5aaa99abc1af871f4516af077b6a96d9469163c492a055b232622fb34
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector pointing to 'https://ttraff.cc/pify?keyword=google+smtp+server'. The document body, though heavily obfuscated, contains text related to 'Google smtp server' and urgency, aligning with a phishing or scam lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.cc/pify?keyword=google+smtp+server
    • http://files.thebookenigma.com/uploads/1/3/2/6/132682787/sagelakaf_durovenodipem.pdf
    • http://files.luckystar1982.com/uploads/1/3/1/8/131856516/ritavajewirusow.pdf
    • http://files.gresford.org.uk/uploads/1/3/0/7/130776069/gofebitebo.pdf
    • http://files.alanphillipsart.com/uploads/1/3/1/6/131636692/5044188.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7128/3098/files/bumilavarixitufazabusaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/xezurilodoneruvi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/54446032482.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/88812815048.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/15914942520.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/sodolexulinibutobepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vejut.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/xadenajopigoji.pdf
    • https://cdn.shopify.com/s/files/1/0435/6413/8651/files/tasegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/26205541945.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/satofekefekuwozavobijogut.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_off000081d8.bin
d9d2e9d97d0b4fd25e69501b5ec0d249c44af265b23dcf8979632edc51670d12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81D8 5020 bytes
font_01_sfnt_off000092e8.bin
28e7e0add42e26fbe0dc25085abb6c0737ba6c88c460e224680c030d4695b215		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E8 11132 bytes

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