Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ee781309fc79e6…

MALICIOUS

PDF

49.8 KB Created: 2020-07-23 08:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8aa87122524a42e8f3ef219325725a2 SHA-1: e595996d21aad5d3d950b74e0979be138ad166f5 SHA-256: 10ee781309fc79e6f7e6634b964d6a79e2fb272a6a863559ce6836771ebd2e18
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of numerous external links suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the overall structure and link analysis point to a malicious intent.

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=tipos%20de%20dolor%20abdominal%20semiologia%20pdf
    • http://files.cobilconnect.com/uploads/1/3/0/9/130969853/6ea8d66a.pdf
    • http://files.shopfybr.com/uploads/1/3/0/9/130969082/9dc852ba008251.pdf
    • http://files.nicholasvicknairdesigns.com/uploads/1/3/1/4/131438528/d454f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9195/1769/files/buzilefawozukoze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sivuduveserekolagaxabulux.pdf
    • https://cdn.shopify.com/s/files/1/0430/8759/3632/files/50435207446.pdf
    • https://cdn.shopify.com/s/files/1/0427/8334/2748/files/lexitolemepol.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/tewelaretevamefemaripo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99913566500.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5524/files/zarezupadibu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/53837289488.pdf
    • https://cdn.shopify.com/s/files/1/0435/9336/7710/files/wapuvepikobamimuliwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1140/files/92112308864.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/miwomavix.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/zumojuderobalow.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/97084154128.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vibamiwa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086e2.bin
b2e4056a5c25f19de3d525665dc3f640c011488d2e8e7ef67fa949c8ecac1c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86E2 5156 bytes
font_01_sfnt_off0000983c.bin
ca21370e841a22fe694f1526f99744bde5e3487cfaec8678393a4527598d697d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x983C 9808 bytes

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