Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a7032ef48310a6…

MALICIOUS

PDF

58.6 KB Created: 2020-08-05 04:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 150ad4944e9da122d161a5cc5bcbd9c2 SHA-1: 5f11435cc2ff8357ae64f9deee1830f75db8d78d SHA-256: 99a7032ef48310a662f9b4e3b9d645168d654c48a24493854c769174a5c17fbc
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 the primary malicious redirector being ttraffic.com. The heuristic firings indicate this is a link farm designed to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or redirection attack.

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.com/wb?keyword=tosaerba%20elicoidale%20manuale%20fiskars
    • http://files.musclehamsterfitness.com/uploads/1/3/0/7/130776114/jepawaf.pdf
    • http://files.jeannesternerdesigns.com/uploads/1/3/0/8/130813701/2677848.pdf
    • http://files.indigenouspoliticalauthority.org/uploads/1/3/2/8/132814342/nobirowe.pdf
    • http://files.alexbuehler.com/uploads/1/3/1/3/131384663/eb5eb8fff4.pdf
    • https://cdn.shopify.com/s/files/1/0428/2934/9030/files/60052714050.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4246/files/kenalitolumusukijiriwewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5236/files/lalisogepunuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4460/9943/files/50335121089.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/60810706399.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/70604034959.pdf
    • https://cdn.shopify.com/s/files/1/0431/6820/2901/files/21433018246.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/gegevejovumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zawitowawipujeko.pdf
    • https://cdn.shopify.com/s/files/1/0433/7968/7587/files/naxabitaxolefosad.pdf
    • https://cdn.shopify.com/s/files/1/0434/4895/9141/files/19596179012.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.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_off00009dfa.bin
653532ab32cd5bc42760c1cf4d96abfc999fb6a5296a0587ebc9846e5125d955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFA 5320 bytes
font_01_sfnt_off0000aff2.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF2 1800 bytes
font_02_sfnt_off0000b87f.bin
109d3d0065184851058e8279f55460bf651d28d7e69d11e60b6c1c9ccdffc7ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB87F 11292 bytes

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