Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b445625c122460…

MALICIOUS

PDF

44.4 KB Created: 2020-08-21 12:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29ccd3fc77476c289d1ac9bb480e28b2 SHA-1: 7c58dc51674a0a8acf54da88389d54bb2d75f474 SHA-256: 41b445625c1224602149fc1bf0a8c6c28f3c4159f44c4aabed9b7d79b6643c59
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to a 'dining table size guide' and embedded URLs, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=dining+table+size+guide
    • http://xizijosa.natevehealth.com/uploads/1/3/1/0/131071252/4844635.pdf
    • http://files.dianastoic.com/uploads/1/3/1/4/131437636/1784592.pdf
    • http://files.snapzphotobooth.co.uk/uploads/1/3/1/4/131413040/xusavewumuxa.pdf
    • http://ruzavet.hopecounselors.com/uploads/1/3/2/3/132303382/2466027.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1670/files/judavup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7127/files/vudirozodaxodi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40545468116.pdf
    • https://cdn.shopify.com/s/files/1/0430/2559/6573/files/heavy_fleece_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/9164/8929/files/zemipesakedogusutaborimed.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/gulabikozuja.pdf
    • https://cdn.shopify.com/s/files/1/0432/2387/5746/files/bobinage_transformateur.pdf
    • https://cdn.shopify.com/s/files/1/0437/5180/0981/files/kipaferakarijuvavevuwiv.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_off000071be.bin
aebc6c016e4b56ab492394f9d49ea00f8fa7a49f931c757c1a328e02fba8366a
pdf-font-stream PDF embedded font (sfnt) at offset 0x71BE 5084 bytes
font_01_sfnt_off0000831d.bin
fa251786cd1c3350d58aff95bc95e55a5ff6120a3a69929912761963ab9db3d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x831D 10036 bytes