Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5577cbede4be6b2…

MALICIOUS

PDF

47.3 KB Created: 2020-08-21 16:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee53760876c729778e061ee097c5cde2 SHA-1: 08af183e37a10b605b1bc7878a0b07de8cca6c11 SHA-256: b5577cbede4be6b23f55d744bb8a9dd6c7a5d38e9a383dc96ca3a8df7bc50b8f
152 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 of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body itself is largely obfuscated but contains the text 'Bactérias gram positivas e negativas pdf' and the malicious redirector URL, indicating a lure to disguise the malicious intent.

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=bact%25C3%25A9rias+gram+positivas+e+negativas+pdf
    • http://temaz.forsythtavern.com/uploads/1/3/0/7/130739430/veravumudez.pdf
    • http://files.clintonstarsfc.com/uploads/1/3/1/6/131606434/6075816.pdf
    • http://files.mattfilmsltd.ca/uploads/1/3/1/3/131380175/tezakafu.pdf
    • http://files.rcoathletics.com/uploads/1/3/0/9/130969046/vagutanop_vibogudifojed.pdf
    • http://files.mcbaronfootball.com/uploads/1/3/2/3/132302735/zewosozofosazi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/wuvozipeluduwimoku.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/joxubodajawobovabenebe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/80625601339.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/90086104942.pdf
    • https://cdn.shopify.com/s/files/1/0434/8801/8598/files/football_manager_2015_graphics.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/risk_management_policy_statement.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3073/files/zezewuvig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4107173541.pdf
    • https://cdn.shopify.com/s/files/1/0430/8123/6634/files/manual_and_automation_testing_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/0453/2648/files/73278261267.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_off000066cd.bin
5586519a7da4e4cd623c035884012e8ba3c50d2dc73b67a7a0480f2de7ac7830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CD 5480 bytes
font_01_sfnt_off0000791d.bin
80b2d44371c9a56e873ac0d72aabe60c513bebca9c9c6c00a9ffd08785cdcddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791D 12660 bytes
font_02_sfnt_off00009f90.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F90 4324 bytes

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