Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cf2c53c84232b0…

MALICIOUS

PDF

40.0 KB Created: 2020-08-11 18:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a83d3ef9de9e215e664dab0aca1b865 SHA-1: 6ae16cf4fe3dd81cd35ed84b20bf75c1129cecb0 SHA-256: 18cf2c53c84232b0604a3b81b976948536877d25a47be25c3d70ca88f0fc164c
202 Risk Score

Malware Insights

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

The PDF contains a lure for an advance-fee scam, presenting itself as a syllabus to entice users to click links. The primary malicious link, https://ttraff.cc/pify?keyword=bsc+agriculture+1st+semester+syllabus+pdf, is identified as a redirector to malicious infrastructure. The document also hosts a large number of links, many pointing to benign Shopify URLs, likely as part of an SEO link farm to improve search engine visibility for the scam.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bsc+agriculture+1st+semester+syllabus+pdf
    • http://files.constitutionpartyms.com/uploads/1/3/2/3/132302963/kuzazetegenedew.pdf
    • http://files.thedigitaldogpound.com/uploads/1/3/1/3/131398236/0097539144370.pdf
    • http://files.cancercars.net/uploads/1/3/1/3/131379439/fujefum-vajipeziwubex-favovuvabejed-sixuritigoko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/42065111087.pdf
    • https://cdn.shopify.com/s/files/1/0432/3246/0960/files/93722568161.pdf
    • https://cdn.shopify.com/s/files/1/0437/9613/6098/files/you_spin_my_head_right_round_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/quicksort_median_of_three.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/61392433591.pdf
    • https://cdn.shopify.com/s/files/1/0437/9328/5277/files/3726659285.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/48844460884.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/structure_of_atoms_and_molecules.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/89044283291.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3111/files/rudesajilokewutudobad.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/subnautica_charge_batteries.pdf
    • https://cdn.shopify.com/s/files/1/0437/5232/5272/files/sokoxasuvewini.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_off00005db3.bin
e992dac9c7c777bc1945594c3d38cbbd1afc3f31af976872fff245b0989b2a6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB3 5816 bytes
font_01_sfnt_off00007173.bin
7f60bc4add1a69c462132eaea305481b3ac8c8f3c57a6d0aa0557003b6e9fd60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7173 9936 bytes

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