Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a1154ffb0b6e43…

MALICIOUS

PDF

44.3 KB Created: 2020-08-10 00:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da1b725d071c4d4240be365db5092a8c SHA-1: 517783a2ef5dbf235ac30412f746dfa562e10107 SHA-256: a2a1154ffb0b6e4307b3fcc8d423b60e1407daf3e3ee530743ff0a2ee13e30e4
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, embedding a large number of external links, many of which point to Shopify domains but are likely part of a broader SEO manipulation scheme. The primary malicious URL identified is https://ttraff.cc/pify?keyword=angaraka+stotram+telugu+pdf, which is likely used to redirect users to further malicious content.

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=angaraka+stotram+telugu+pdf
    • http://files.eviehatch.co.uk/uploads/1/3/1/3/131398091/volilozipawifer.pdf
    • http://files.janetreidwilsonfineart.com/uploads/1/3/1/6/131607404/jipofesod_zefir.pdf
    • http://files.cyclingadventures.net/uploads/1/3/2/6/132695689/sulexovabub_bubizelogu_mekodovi_pinuvawenun.pdf
    • http://files.doggiedaycareconsulting.com/uploads/1/3/1/4/131407692/gekusadazub.pdf
    • http://files.fritosport.com/uploads/1/3/0/7/130775511/reraf-mejemuropo-domoj-serow.pdf
    • https://cdn.shopify.com/s/files/1/0448/1161/6418/files/examples_of_directional_and_nondirectional_hypothesis.pdf
    • https://cdn.shopify.com/s/files/1/0435/8320/9633/files/45360597262.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/6666941989.pdf
    • https://cdn.shopify.com/s/files/1/0429/5163/9196/files/jozumikenepa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7496/7965/files/85313304832.pdf
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/tatigenuxivekabovako.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/miwab.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8242/files/39779075692.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/53831465797.pdf
    • https://cdn.shopify.com/s/files/1/0447/7501/4566/files/xopazazelev.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1487/files/40358412083.pdf
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/sojoxekamevigubakuvupu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2645/files/algarve_tourist_map.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_off000054fc.bin
21a6ea94660e70b61b6e449d5aac4011055914de36a1eb861fff38e37875b2de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54FC 5248 bytes
font_01_sfnt_off000066c0.bin
b6606db8b5f32a3a27d8f1a8b4b6f6c5495d6a41a35ad1ac51f8d18f614359d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C0 14676 bytes
font_02_sfnt_off00009430.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9430 4324 bytes

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