Malicious PDF — malware analysis report

Static analysis result for SHA-256 156896529e969706…

MALICIOUS

PDF

60.8 KB Created: 2020-07-30 15:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda7c63ed10a6b56fbe5b4be1a2ac516 SHA-1: 9cfa76ea278f5f889a1861a1c3ed51754c4b9e76 SHA-256: 156896529e9697064a58a07cd7c26b19f8db64cf64f39b43ef05fa4416c79c54
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a PDF SEO link farm. The primary URL, 'https://ttraff.ru/pify?keyword=robert+sapolsky+behave+pdf', is flagged as a known malicious redirector. While no scripts were extracted, the sheer volume of links and the malicious redirector strongly suggest an intent to lure users to harmful sites, potentially for phishing or malware distribution.

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.ru/pify?keyword=robert+sapolsky+behave+pdf
    • http://files.rightagri.com/uploads/1/3/1/1/131164009/9657356.pdf
    • http://files.fbccrescentcity.org/uploads/1/3/0/7/130775603/2bb3ba.pdf
    • http://files.siouxcenterwaa.org/uploads/1/3/2/3/132303219/patedupepobi_livagenixu_nudosiwatu.pdf
    • http://files.dnewzdesign.com/uploads/1/3/0/7/130739835/4630712.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9350/7737/files/remulabefinetagikuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2824/files/21842752781.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/suposogom.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/31907940146.pdf
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/boxodoguten.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5288/files/nawisiselarewi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/gogigedoji.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/raneruxerexelazosona.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/61510775486.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/72076265921.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/fipob.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/noguguxevutetufetigetu.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_off0000b0fa.bin
178dab74fe90fdcbe92b80f807218fc57d22ea787b674643d2e0e0f9ea6e598b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FA 5136 bytes
font_01_sfnt_off0000c28d.bin
5f8944c157d068152acbcb872773cac3a07d30dc201fcd720e1f035b510d6aca
pdf-font-stream PDF embedded font (sfnt) at offset 0xC28D 10316 bytes