Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea16fb73a28c0c4…

MALICIOUS

PDF

45.3 KB Created: 2020-08-08 21:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dee49600395f0e9a7c196c03a8d48ebf SHA-1: 41d2c33091dff8c72948334e6f7b9e4913477aa8 SHA-256: bea16fb73a28c0c49d34aac2fb480c8a17e0f9216425cdf7055da82015d2085b
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to `https://ttraff.com/pify?keyword=isometric+drawing+exercise+examples+pdf`. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a content-driven lure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=isometric+drawing+exercise+examples+pdf
    • http://files.quintessencesilk.com/uploads/1/3/1/4/131437378/kedelazesubu_lanoduxiko_gonumo.pdf
    • http://files.mrsanntutoring.com/uploads/1/3/1/8/131856539/ruwurorar.pdf
    • http://bekoge.lesliecarpenterholtphotographer.com/uploads/1/3/1/3/131380126/tosujemaruzudebuwoj.pdf
    • http://files.roberts-plywood.com/uploads/1/3/0/7/130776573/845482.pdf
    • https://cdn.shopify.com/s/files/1/0432/0293/6992/files/rutina_completa_de_calistenia.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/89564337335.pdf
    • https://cdn.shopify.com/s/files/1/0432/9429/4171/files/28864646112.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/51105253332.pdf
    • https://cdn.shopify.com/s/files/1/0436/3337/7440/files/witevixebageruxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7218/3703/files/95603283730.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/33902027993.pdf
    • https://cdn.shopify.com/s/files/1/0429/7362/6524/files/goxaserelubuwepi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/kupalagumimafifupozonotex.pdf
    • https://cdn.shopify.com/s/files/1/0433/4292/1886/files/41818145210.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9027/files/thyroid_diet.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_off00006655.bin
6e2a6ea7a8c6402dc8caf656e552bfb77d62d40b0b2cad9f7a51e303fae9fa15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6655 5360 bytes
font_01_sfnt_off0000788e.bin
0c9ca3954d9fa92193080136ad867e98fa4a87b5400beb45ee2de18aeb2ea3a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x788E 9712 bytes
font_02_sfnt_off000099d0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D0 4324 bytes

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