Malicious PDF — malware analysis report

Static analysis result for SHA-256 3369cb7163dd5fbf…

MALICIOUS

PDF

44.8 KB Created: 2020-08-03 03:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0554258d42064ef066101ffb42b3806 SHA-1: 822af12e2bdb1078098780b2772955bebf4d5379 SHA-256: 3369cb7163dd5fbf3e3e4324b624a368713eaa34cab43abda8320e254de1732c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, forming a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and the target URL, suggesting a lure to a malicious site.

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=icy+veins+outlaw+rogue+talents
    • http://files.blueskytollers.com/uploads/1/3/0/7/130775866/5033848.pdf
    • http://files.hannahviera.com/uploads/1/3/2/7/132710697/duriserubiguresaw.pdf
    • http://files.farcornersmusicals.org/uploads/1/3/1/4/131406104/c4e845967d604.pdf
    • http://files.vetswithhorsepower.com/uploads/1/3/2/6/132681698/defasobukamifexavidu.pdf
    • http://files.disciplesofthemysterium.com/uploads/1/3/1/4/131406108/dec3a5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/kedinosafikibozo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/finifevogelivomefumil.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7399/files/74504781492.pdf
    • https://cdn.shopify.com/s/files/1/0434/9453/9429/files/loxexagoxofokonuxomew.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/37258686187.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/gomirepubanekenerololisil.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/6997/files/70443398698.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5602/files/temizarujaxapigiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3651/6250/files/zudegased.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/dawepevuji.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6843/files/tuwexumanipurorosetel.pdf
    • https://cdn.shopify.com/s/files/1/0436/8610/1145/files/90703652645.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_off0000720e.bin
dbfbef81f1cf28afc076c84aef427752319e933ba3d154ec3f91bc7b584ba790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720E 5156 bytes
font_01_sfnt_off000083cd.bin
2aa9b55b9676ff5f80e0a4a1c131e412162a22818eaf38fb54a82f9f2f1e4a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83CD 10136 bytes

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