Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9502b3c72340f27…

MALICIOUS

PDF

47.4 KB Created: 2020-07-23 08:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bf981a7824e9fab708c10f3cd13e1fe SHA-1: 54a2b37ca8aa2b0bb3afca30c334db368bf93e9c SHA-256: a9502b3c72340f272f1dbe70baabc8347e94f86b41814c930b3807998f05c07d
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure (https://ttraff.cc/wb?keyword=fippa%20bc%20pdf). Another critical heuristic indicated a PDF link farm with 19 external PDF links, predominantly hosted on cdn.shopify.com. The presence of these link farms suggests an attempt to distribute malicious content or conduct phishing operations.

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/wb?keyword=fippa%20bc%20pdf
    • http://files.guldustah.com/uploads/1/3/1/3/131383453/wajamafifebovir_pesakoxidogak.pdf
    • http://files.digitalpds.com/uploads/1/3/2/6/132696080/3800985.pdf
    • http://files.calvarymanzanita.org/uploads/1/3/1/3/131380436/6d1e819.pdf
    • http://files.kiwiretreat.co.nz/uploads/1/3/2/6/132681294/4780495.pdf
    • http://files.tombstoneantiquemall.com/uploads/1/3/2/7/132710679/3e964d3e59e2.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/68231082529.pdf
    • https://cdn.shopify.com/s/files/1/0430/5525/1605/files/37011970477.pdf
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/55682430434.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/porebitida.pdf
    • https://cdn.shopify.com/s/files/1/0431/1826/4469/files/jolaxoline.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wudusojixidotivage.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/babebo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5484/0485/files/fesanasep.pdf
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/7737651516.pdf
    • https://cdn.shopify.com/s/files/1/0433/6323/8056/files/39047035232.pdf
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/96332044317.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/70508806392.pdf
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/potizesenunejim.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8352/files/35282858220.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_off0000805a.bin
00f20223ec2084415d5ced7c089cc107ffa1e38bc6a143e055b40246e90e3c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805A 4312 bytes
font_01_sfnt_off00008ef1.bin
7718f0fdd832ab32d3a7c1fe2e7f6e37e71a2960cb3dd589f7f181d5f3c2c449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF1 9844 bytes

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