Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb94bc33e7af3233…

MALICIOUS

PDF

46.2 KB Created: 2020-08-15 05:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd1e732bd765647349a2fd4770c4964e SHA-1: 7b9e9eb876a20f017b3a1593ac64038eb573b9f3 SHA-256: fb94bc33e7af32338533fa45c9b508278eec3d43937bc1cb8ab19b254c460386
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One such link, 'https://ttraff.ru/wb?keyword=learning%20licence%20test%20questions%20pdf%20in%20punjabi', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking URLs hosted on Shopify, likely to lend legitimacy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/wb?keyword=learning%20licence%20test%20questions%20pdf%20in%20punjabi
    • http://ripapegaf.northerncherokeenation.com/uploads/1/3/2/7/132740353/zalotejoxe.pdf
    • http://zukiwo.9applesgame.com/uploads/1/3/1/4/131482995/sijotupikitubu-vumelu-zuniwosa.pdf
    • http://jiwolizi.venturelibre.com/uploads/1/3/2/8/132815961/7553095.pdf
    • http://zeboriv.carolsullivanperkins.com/uploads/1/3/2/8/132814718/novinumo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8759/files/farmacos_antagonistas_de_calcio.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/bel_ami_maupassant_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0433/4498/6280/files/72170736178.pdf
    • https://cdn.shopify.com/s/files/1/0447/9824/7078/files/xuvuvasanorumasowixe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6970/files/burafavibubizipesobopa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/aliphatic_and_aromatic_hydrocarbons_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6766/files/fundamental_astronomy_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7935/1968/files/articulos_de_placa_dentobacteriana.pdf
    • https://cdn.shopify.com/s/files/1/0435/4598/5192/files/download_come_get_her.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/vemelawipedisoxiwote.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000721f.bin
5f5e516d1108cb51d45487911657f150e9916ecba4813f8534c9dfa567c43028
pdf-font-stream PDF embedded font (sfnt) at offset 0x721F 5608 bytes
font_01_sfnt_off00008530.bin
760cf9963711b44285b7bbe8ab3977231cf1c80177b854a9239056525942810b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8530 10736 bytes