Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f41c5ecb4c924c…

MALICIOUS

PDF

50.5 KB Created: 2020-07-23 13:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdb149ec2399edc65df4aa48f9c94623 SHA-1: 4ff734dc5a494d6999cb5a692aa4104384bc1bf2 SHA-256: c9f41c5ecb4c924ca324ce253249221ebbf2cb282d573a99ee412702c0623b0c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with at least one leading to a known malicious redirector. The document's content, while appearing to be about an academic topic, is likely a lure to drive traffic to malicious infrastructure. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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/wb?keyword=emergence%20of%20sociology%20as%20a%20scientific%20discipline%20pdf
    • http://files.grettawilson.com/uploads/1/3/1/4/131437351/5306487.pdf
    • http://files.alphawomenscentermn.com/uploads/1/3/0/9/130968993/vebefez_koxixosiwawelol_perowedevaj_warebowaxip.pdf
    • http://files.durhamsciencefair.ca/uploads/1/3/1/4/131454172/1358feddd0.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/60664783420.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/zadizajezokisu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0644/1110/files/27733558297.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8389/files/67960667437.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/xalegoboxomufebijewepari.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6334/files/6100328516.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72707516801.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/
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/zadizajezokis

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008736.bin
fdc87ba43e1c7ed02352056875ba01e73d9ef4227fbf61faca71479e08d4d80e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8736 5320 bytes
font_01_sfnt_off00009936.bin
fbccc41eea250616be16c7259b2cf54f61f67d1b990ec3a2a8f7067dbe6c46cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x9936 10520 bytes