Malicious PDF — malware analysis report

Static analysis result for SHA-256 9231d10314188ade…

MALICIOUS

PDF

36.4 KB Created: 2020-08-20 18:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e7fa02b709a33327b422cbb99739822 SHA-1: 1fa9d5703ae413072c6f0f03745d4ce6aa69fd0e SHA-256: 9231d10314188ade4b9e650f9c81f7f3093a0179ba6db1f1c9774a3748553a9d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text, though partially corrupted, includes the URL 'https://ttraff.cc/pify?keyword=worksheet+works+possessive+nouns', which is a known malicious redirector. The presence of numerous other links hosted on cdn.shopify.com suggests a link farm designed to obscure the ultimate destination and potentially spread malware or phish for credentials.

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=worksheet+works+possessive+nouns
    • http://files.lgcsf.org/uploads/1/3/0/7/130775245/bafarivo.pdf
    • http://lixomam.ears2yourtrip-travel.com/uploads/1/3/0/7/130776499/nerofenimeda_jakikivepe_verajosizuvofuf_zemuferojame.pdf
    • http://files.marionfitness.com/uploads/1/3/2/3/132303013/bemudupew.pdf
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/goreva.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5589/files/nuzogagovewakox.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/kurupa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/41565208720.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/17146235802.pdf
    • https://cdn.shopify.com/s/files/1/0466/4459/2805/files/xijigol.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/34445210708.pdf
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/shakespeare_beaucoup_de_bruit_pour_rien.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/kolamerusevomezoxijarip.pdf
    • https://cdn.shopify.com/s/files/1/0432/4157/0466/files/collins_vocabulary_for_ielts_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/venoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/0391/2098/files/lemekirudok.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_off0000511b.bin
a4225f26a7efa7f56b5784e1c3d0b78eabd4e96508bd6865cc02bbeb23cc00dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x511B 4892 bytes
font_01_sfnt_off000061e3.bin
1fa79b07cf4ebb5654731e2e5d5fb2cf406befff943f5e757d22f042976ff276
pdf-font-stream PDF embedded font (sfnt) at offset 0x61E3 10244 bytes