Malicious PDF — malware analysis report

Static analysis result for SHA-256 4544503b943b2ae1…

MALICIOUS

PDF

44.9 KB Created: 2020-07-30 08:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8c371a1b1502ea2416dfc97f6580a79 SHA-1: 0805df074be39b3eec3a4aaa8bb7ffa29cb2253b SHA-256: 4544503b943b2ae1d8772ec977b4d0fecb775b1dab4e2febb6a6eb5c32743a5a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its lure, but the presence of a link farm suggests an attempt to manipulate search results or phish users. No scripts were extracted from this sample.

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/pify?keyword=energia+eolica+no+brasil+2020+pdf
    • http://files.vuebuilder.com/uploads/1/3/1/8/131871462/sosimiro.pdf
    • http://files.franciaitaliaweddings.com/uploads/1/3/0/7/130740571/6719935.pdf
    • http://files.mnhistoryalliance.org/uploads/1/3/0/7/130775013/jenatesojox-vusuva-wabekeb-zemireli.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/vepez.pdf
    • https://cdn.shopify.com/s/files/1/0438/4840/1046/files/59292109461.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/67662124824.pdf
    • https://cdn.shopify.com/s/files/1/0429/9381/1619/files/zajizirekafibelizod.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/dibidilomuduk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdf
    • https://cdn.shopify.com/s/files/1/0436/0998/1085/files/komumamikuwaje.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/98211962983.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/vetigewu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5046/files/15789712505.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/70737538349.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/1/0429/8581/6218/files/dib

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070d4.bin
4d98e64c210ba088cb8fea70ad173934dddf5daccc3d44c50dc3137c482476a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x70D4 5400 bytes
font_01_sfnt_off00008326.bin
35a259c3d707c733f660cbc531a3456f8d069c41c182cf66659e6f4a17d818a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8326 10452 bytes