Malicious PDF — malware analysis report

Static analysis result for SHA-256 074e37c6803c6cff…

MALICIOUS

PDF

42.8 KB Created: 2020-08-23 23:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2830a5df343683af31c628b5e5c6c29d SHA-1: dbe318fe0a1af32c553566b8b0914ef1a1acf55b SHA-256: 074e37c6803c6cff1e2b5eed86820821897762bd8625471a0846f6a8b77dc321
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDFs. One of these links, https://ttraff.cc/pify?keyword=lagu+bandung+lautan+api, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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.cc/pify?keyword=lagu+bandung+lautan+api
    • http://poletuz.alexandradeglise.com/uploads/1/3/1/1/131164456/681490.pdf
    • http://madur.digivationsxgens.org/uploads/1/3/1/4/131406947/lozow-tixajeperepives-wuvuju-livaxupuwi.pdf
    • http://kofaxaw.lovelashed.com/uploads/1/3/0/7/130776485/9092770.pdf
    • http://bukojoto.maryemorall.com/uploads/1/3/1/3/131379685/6171327.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/6500/3423/files/nebis.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/archetypes_in_literature.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8871/files/sovuxuga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/livoxigugefeguvon.pdf
    • https://cdn.shopify.com/s/files/1/0463/0645/9810/files/12738583146.pdf
    • https://cdn.shopify.com/s/files/1/0433/6697/3598/files/schema_analisi_periodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/docker_run_interactive.pdf
    • https://cdn.shopify.com/s/files/1/0437/2247/3624/files/42837176244.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/sazodixa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/67825975097.pdf
    • https://cdn.shopify.com/s/files/1/0437/1608/3877/files/waguwug.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0320/files/diccionario_psicologia_social.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_off00006ab4.bin
3ae0dde1246fb332e85592c81275e38e20af68957395528c3cfdea5e94e4c43d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB4 4936 bytes
font_01_sfnt_off00007b8a.bin
3116bfc19302aa7ad08ab7b15ce7311363fc8ab9e2ad500ed4b08b30a867ed51
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8A 10192 bytes