Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b1b815902e4d14…

MALICIOUS

PDF

41.6 KB Created: 2020-08-14 05:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1954c2dc1bf3025007e0b487257b8a1 SHA-1: b07ce1ea6d9f4c089359cd6ea924769bb80fe58f SHA-256: 12b1b815902e4d14a74bb95a1f48d62a14fc24c45d0a0f3909670c537c934b71
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness, and the document body text, though obfuscated, includes the malicious URL and references to 'alphazero paper pdf', likely a lure. The presence of many Shopify links suggests a link farm used to obscure the true malicious destination.

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.com/pify?keyword=alphazero+paper+pdf
    • http://files.bilboshappypaws.com/uploads/1/3/1/1/131164125/vasusivobowozosojo.pdf
    • http://vitafida.dchatt.com/uploads/1/3/1/4/131453133/modebedikelo.pdf
    • http://files.victoriatautke.com/uploads/1/3/2/7/132712174/tavun.pdf
    • http://files.paulashleyfowlerphotography.com/uploads/1/3/0/7/130775027/8706118.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0974/4789/files/list_of_car_manufacturers.pdf
    • https://cdn.shopify.com/s/files/1/0428/7817/3351/files/afrikaner_cattle.pdf
    • https://cdn.shopify.com/s/files/1/0433/6268/0984/files/bunejegone.pdf
    • https://cdn.shopify.com/s/files/1/0435/6577/7059/files/koluzimuwevusubamib.pdf
    • https://cdn.shopify.com/s/files/1/0431/2819/3184/files/lista_de_antibioticos_de_amplio_espectro.pdf
    • https://cdn.shopify.com/s/files/1/0431/6636/7895/files/polaler.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/vikilajivubifibobunujubo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6909/files/baudelaire_poemas_en_prosa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/nupisutanabisekajilu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3206/8775/files/83757015424.pdf
    • https://cdn.shopify.com/s/files/1/0451/2625/4745/files/diferencias_entre_aprendizaje_cooperativo_y_colaborativo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/14167635859.pdf
    • https://cdn.shopify.com/s/files/1/0435/1534/7103/files/zopusabasirufo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2943/6315/files/corsair_headset_software.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_off0000666b.bin
0866145fdfdc0849a3bdcfc33529f5e2111878f8900a2d187b1b673afd00366a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666B 4992 bytes
font_01_sfnt_off00007762.bin
be6536556bba52d7c2982f67854abe0419ebc4582d5cfb20e749338dd9b5bf49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7762 10104 bytes

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