Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f44f19c1012192…

MALICIOUS

PDF

48.4 KB Created: 2020-08-18 14:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5f61465cd81a97df0652b91928cb7e1 SHA-1: 4a3b2e6efdd49ccf60f049700b9a1d293041fe4b SHA-256: d9f44f19c10121921df7017b7e0d99647f02fc86128e231455f9823805ac31d5
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=barbour+t+shirt+size+guide'. This URL is embedded within the document body, suggesting a social engineering lure to trick users into clicking it. The PDF also contains a large number of external links, many of which point to Shopify domains, but at least one is hosted on a suspicious domain ('files.centelmedia.biz'). The ML classifier strongly indicated maliciousness.

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=barbour+t+shirt+size+guide
    • http://files.centelmedia.biz/uploads/1/3/2/6/132695360/28aee496d305c.pdf
    • http://files.milkearlyparentingsupport.com/uploads/1/3/2/7/132712011/tidap.pdf
    • http://files.lucindaroweart.com/uploads/1/3/1/3/131380000/4228b0f.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2392/files/19900584117.pdf
    • https://cdn.shopify.com/s/files/1/0429/1228/4831/files/81157779241.pdf
    • https://cdn.shopify.com/s/files/1/0435/1374/1472/files/5070953956.pdf
    • https://cdn.shopify.com/s/files/1/0437/8814/0696/files/len_function_python.pdf
    • https://cdn.shopify.com/s/files/1/0429/4583/9271/files/reading_comprehension_worksheets_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/wedadubog.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/gta_libertycity_stories_psp_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/bigilaripopirolivusidotu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0582/9532/files/tuxex.pdf
    • https://cdn.shopify.com/s/files/1/0434/0924/4316/files/9168583942.pdf
    • https://cdn.shopify.com/s/files/1/0437/8394/6397/files/fuwete.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4741/files/wefana.pdf
    • https://cdn.shopify.com/s/files/1/0436/8472/4889/files/nepipivozorajabasevinopoz.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_off0000694f.bin
a65bc362cdace39c1bdbbd87a3cec44f622ea2c067ddc0bee52bc1250d271f33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694F 5072 bytes
font_01_sfnt_off00007aa9.bin
66b6ebe7fbaf88dd6085d4b4b545f4d5d254fabfd5f8604c38c156b456fa270e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA9 14216 bytes
font_02_sfnt_off0000a6e5.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E5 4324 bytes

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