Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efd3c278b197f4a…

MALICIOUS

PDF

44.0 KB Created: 2020-08-15 17:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7279a8762a004d9e5bfa76fa97e47fc SHA-1: c7165e59cc52a32374d2cca7c689a0f7292e3535 SHA-256: 7efd3c278b197f4a81ea3642fce3f6fbdb980b233e2aed946ff6865ec86eb574
152 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, many of which point to a link farm designed to obscure the ultimate destination. The primary malicious URL identified is ttraff.ru, which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but does include the malicious URL.

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/wb?keyword=upstream%20a1%20test%20booklet%20pdf
    • http://lesuki.marissamoses.com/uploads/1/3/1/3/131384618/eca660cd61c9ae.pdf
    • http://files.kelcurtmedia.com/uploads/1/3/0/7/130776266/095c32b2cfd.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7427/files/91993655652.pdf
    • https://cdn.shopify.com/s/files/1/0446/2444/5603/files/administrator_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/bagivadujofej.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/dezatanebes.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6818/files/wheater_istologia_e_anatomia_microscopica._download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5032/6426/files/sustainable_energy_authority_of_ireland_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/3136/3747/files/47934792049.pdf
    • https://cdn.shopify.com/s/files/1/0431/1328/3735/files/detailed_lesson_plan_in_english_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/2484/2906/files/94931971234.pdf
    • https://cdn.shopify.com/s/files/1/0440/4579/5493/files/bsc_cbz_notes.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/37479714606.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/metegemekipezafekude.pdf
    • https://cdn.shopify.com/s/files/1/0436/0699/9203/files/mezonuliki.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_off00004ed1.bin
72ae160cf0c7f75808a2164d5bca98a618a5c715625bdd4e80c099329b7a67af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED1 6756 bytes
font_01_sfnt_off000065be.bin
d62aca5ea5092171898e564ff238133f1a4eb33b98856bb33eb44928a9ea48f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 5432 bytes
font_02_sfnt_off00007821.bin
efa316479ca3d22a750676e2faadc074200f6a6d5b1070b62f10126288534857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7821 13256 bytes

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