Malicious PDF — malware analysis report

Static analysis result for SHA-256 413f21bcd56fe209…

MALICIOUS

PDF

54.1 KB Created: 2020-08-15 20:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f14f28b21f0c64c73a83bdcc9fab5929 SHA-1: cde9229dc207e471b86ca2f910c75e0549a654ef SHA-256: 413f21bcd56fe209e03f11794329a3697397721ceafdf017ddaaf4d83ad93a5e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary link pointing to a known malicious redirector at `https://ttraff.com/wb?keyword=trichomoniasis%20infection%20pdf`. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to lure the user to this malicious site under the guise of providing information about a medical condition. The ML classifier strongly supports the malicious nature of this PDF.

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=trichomoniasis%20infection%20pdf
    • http://files.greenejunglefarm.com/uploads/1/3/1/6/131637219/2bc504.pdf
    • https://cdn.shopify.com/s/files/1/0433/4089/0262/files/14069340644.pdf
    • https://cdn.shopify.com/s/files/1/0435/9441/6290/files/wenutimov.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5023/files/78326242337.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/78011764566.pdf
    • https://cdn.shopify.com/s/files/1/0431/1397/1861/files/78914129832.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/rijolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/71716973283.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2864/files/82563633853.pdf
    • https://cdn.shopify.com/s/files/1/0431/0053/6986/files/12845213478.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/wuxodaguwisosudepedumowob.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_off0000969e.bin
e95c7d9638549448c8a7e58f1a4dd66ac1f92b64c9e73836ae17d68d9182ecd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x969E 5312 bytes
font_01_sfnt_off0000a87a.bin
7dbcd9067927696740bb246cf0d05240c1701ed5f26933dea277183ab2e0b2fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA87A 10372 bytes

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