Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfc67cec109564b…

MALICIOUS

PDF

47.1 KB Created: 2020-08-15 16:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b4a61ea9906d3e3dbc7b1457a845c01 SHA-1: b1d974e0a9a5a7653e2a18d6d57b738fc16e72bc SHA-256: 2dfc67cec109564be2d6a3569881f637b6abebc196fe4663aff34b4cb0dbe4b1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm. This suggests the document's primary purpose is to lure users into clicking malicious links, likely for phishing or malware distribution. The ML classifier strongly supports the malicious verdict.

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=freemake+video+converter+pro
    • http://files.mrc-k9.com/uploads/1/3/2/8/132814343/garov.pdf
    • http://fofitud.walshinthecloud.com/uploads/1/3/1/3/131383483/sejusisofara.pdf
    • http://wazimo.hartfund.org/uploads/1/3/1/3/131380600/tekif-riwasew-genul-guromegejijolav.pdf
    • http://files.synergyhairandbeautyelloughton.co.uk/uploads/1/3/1/4/131437194/364f6f8.pdf
    • http://voxim.natepage.com/uploads/1/3/1/3/131383309/gebowijifuniduwiwod.pdf
    • https://cdn.shopify.com/s/files/1/0435/8507/7405/files/molepemezukusos.pdf
    • https://cdn.shopify.com/s/files/1/0428/1116/2790/files/tojifonevubenapubixoforif.pdf
    • https://cdn.shopify.com/s/files/1/0433/3754/7929/files/15_minute_binary_options_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7493/files/similar_triangles_worksheet_grade_9.pdf
    • https://cdn.shopify.com/s/files/1/0436/3167/3502/files/90978548486.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/63880107619.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/chiang_kai_shek_biography.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ce4.bin
c98260f6068467b529c2a6648a0f50911c60d351ca2f1f7adef3e17f1235b0f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE4 4876 bytes
font_01_sfnt_off00007d60.bin
f872a6b81a3a7c9baa78fa8c8e8074ccef71805bcf824d918c7d50d3e2bd633c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D60 10580 bytes
font_02_sfnt_off0000a19d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA19D 4324 bytes