Malicious PDF — malware analysis report

Static analysis result for SHA-256 170a4d941fcaa23b…

MALICIOUS

PDF

43.0 KB Created: 2020-08-21 06:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c72114a4e44c55e5c29b8fdb19ee77f1 SHA-1: aa76af5bf3826a20842d0008c4aca20e09a74c4e SHA-256: 170a4d941fcaa23bdb4d91989b913951df33a5fe59d20d9f4120fe68cd44f4da
194 Risk Score

Malware Insights

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

The PDF contains a lure for an advance-fee scam, as indicated by the heuristic 'SE_ADVANCE_FEE_SCAM_LURE'. It embeds multiple links, one of which, 'https://ttraff.com/pify?keyword=android+web+browser+that+support+flash+player', is identified as a malicious redirector. The document body also contains this URL, suggesting it is the primary mechanism for leading the user to a malicious site. The presence of numerous PDF links, many hosted on Shopify, indicates a link farm designed to distribute the scam.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=android+web+browser+that+support+flash+player
    • http://polegoben.greeksns1.com/uploads/1/3/1/4/131438405/2982761.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7473/8593/files/sba_form_413.pdf
    • https://cdn.shopify.com/s/files/1/0437/6202/4605/files/ebola_virus_infection.pdf
    • https://cdn.shopify.com/s/files/1/0428/7895/9775/files/bufuzowur.pdf
    • https://cdn.shopify.com/s/files/1/0434/8326/7234/files/wetibodisuri.pdf
    • https://cdn.shopify.com/s/files/1/0439/0731/7912/files/sisepavumibevopaxek.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/69361219602.pdf
    • https://cdn.shopify.com/s/files/1/0449/0412/0475/files/remote_bullets_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0465/9324/5349/files/gerofedajo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2982/9544/files/55586301802.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/vevuripupujikiwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/44478249338.pdf
    • https://cdn.shopify.com/s/files/1/0436/9770/1032/files/sedapev.pdf
    • https://cdn.shopify.com/s/files/1/0440/4989/1478/files/usar_el_cerebro.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_off0000682d.bin
fa10102f25e202bdb91b7f556a50ea6e15f825dee67320ca46737567a25237e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682D 5452 bytes
font_01_sfnt_off00007abe.bin
4488ae0746f332f4b72c49c8b8a7f520c50148e023c893f1eabfc3337240365d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABE 10516 bytes

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