Malicious PDF — malware analysis report

Static analysis result for SHA-256 5125cb29342c2f7d…

MALICIOUS

PDF

51.4 KB Created: 2020-08-10 03:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b11adb4a6cfe070b667a1700508b68f SHA-1: 91993e012b70538ba2f1fc2d7932ebe027dc5dc6 SHA-256: 5125cb29342c2f7d37b2800902cd7d947be40d91324b2e4d8439b404b05a89ba
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 `https://ttraff.cc/pify?keyword=learn+traditional+chinese+characters+pdf`. This link is presented within the document body, disguised as a resource for learning Chinese characters. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to Shopify domains, suggesting an attempt to distribute malicious content or manipulate search engine results. The ML classifier strongly indicates 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.cc/pify?keyword=learn+traditional+chinese+characters+pdf
    • http://files.whsgt.org/uploads/1/3/2/6/132681352/ridofedinixekami.pdf
    • http://files.merrimacohd.com/uploads/1/3/1/3/131379828/zukelazemonisu_senowizinugew_bukev_xitifab.pdf
    • http://files.elikalnonwoven.com/uploads/1/3/0/8/130814208/2d41ec9126ebed.pdf
    • http://files.elikaln
    • https://cdn.shopify.com/s/files/1/0434/6436/0100/files/44946477023.pdf
    • https://cdn.shopify.com/s/files/1/0434/9850/4354/files/zivagewevoxuxobisadi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3799/files/pibixaposiki.pdf
    • https://cdn.shopify.com/s/files/1/0438/0327/9517/files/classical_mechanics_john_taylor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/boxibaterawafamepemas.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/33324148025.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9479/files/business_management_ib_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/2744/8476/files/66764148955.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/98040206833.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/30186363572.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/82388719983.pdf
    • https://cdn.shopify.com/s/files/1/0428/6382/0959/files/pezipupufofonan.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_off0000734f.bin
12c14330fb33ae8d96538463974be7d2385141cfa39b5de10718301fada33b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734F 7248 bytes
font_01_sfnt_off00008b01.bin
0baad6e47172f0f0f7bb489900615a85a03839c96b0adaa853f51dea6b3f14f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B01 5184 bytes
font_02_sfnt_off00009ca2.bin
481c0547ce763f267ae1fa68af3996fc49fbd058a52bc35d25d406dd4858bda2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA2 10388 bytes

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