Malicious PDF — malware analysis report

Static analysis result for SHA-256 7421dc92bf85e786…

MALICIOUS

PDF

37.2 KB Created: 2020-08-26 11:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d33e8f013a97d7e4726c6296259a91f SHA-1: 6df5d1156c90f76f45c15800ae8ca4c7a9035183 SHA-256: 7421dc92bf85e786bf36f2221eca00d05906dbda98444b3f525ca82589bda8df
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=samsung+s3+mini+over+the+horizon+zil+sesi+indir'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded links and the redirector URL strongly suggest an attempt to lead the user to malicious content.

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=samsung+s3+mini+over+the+horizon+zil+sesi+indir
    • http://wuluj.agapeunlimited.org/uploads/1/3/0/7/130740178/4788008.pdf
    • http://noxelesuf.planthespace.com/uploads/1/3/0/8/130874063/woseseso.pdf
    • http://tivezefas.josef-zlamal.com/uploads/1/3/2/6/132683459/198843282ace5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5419/4085/files/sakazexovajufog.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/kopisono.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nomevorijodasulalo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/artritis_cronica_infantil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/govizatifeze.pdf
    • https://cdn.shopify.com/s/files/1/0435/3068/2519/files/8._2_chlorophyll_and_chloroplasts_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/4760/6679/files/pip_install_not_working_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/dyslipidemia_guidelines_2016_summary.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/yesterday_beatles_classical_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0431/9471/2228/files/37845716070.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045cb.bin
cb1288d261974d920dec56452ac0f84146a47261de91cd61159339ab5f51e382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45CB 5500 bytes
font_01_sfnt_off00005851.bin
a0600613a9ed9ac47b274ff05b37f0db058e32a35800f512a26dd07c912dbddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5851 9820 bytes
font_02_sfnt_off000079b9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B9 4324 bytes

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