Malicious PDF — malware analysis report

Static analysis result for SHA-256 031db14c5d803ace…

MALICIOUS

PDF

43.7 KB Created: 2020-08-08 19:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8189a4bd317f2030e4b364a448c3b04 SHA-1: 5c7273ee7fce24b3dd9beafbdf79196125a2e81d SHA-256: 031db14c5d803acedf7a4b84a7e80146e59269f8c36c63c6137a6b9e4a6e6a17
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a '2020 calendar telugu pdf' lure, which aligns with the malicious redirector URL. The presence of many links, including those to benign Shopify files, suggests a link farm tactic to obscure the malicious destination.

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=2020+calendar+telugu+pdf
    • http://files.htcatholicschoolmyrtlebeach.com/uploads/1/3/1/4/131437119/69fadc11.pdf
    • http://pagipoj.crimsonrichdesire.co.uk/uploads/1/3/1/6/131607163/30b904a9.pdf
    • http://files.callierodina.com/uploads/1/3/0/8/130814056/6e2e06.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/first_day_of_school_activities.pdf
    • https://cdn.shopify.com/s/files/1/0437/1405/2247/files/the_carpenters_greatest_hits.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6679/files/zidegizip.pdf
    • https://cdn.shopify.com/s/files/1/0437/3181/2504/files/nunufejeworogu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4312/files/lufobesutekudevifexap.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/lened.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/voragoxakisi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/download_books_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/42797844004.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokixud.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/sipewebadeki.pdf
    • https://cdn.shopify.com/s/files/1/0433/0396/0731/files/different_types_of_cerebral_palsy.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9701/files/picadora_de_pasto_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ee.bin
c8e516f7ab8e0927f74aa28cec661567f585f81f76ccddf7ff2e954f14ea1238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EE 5324 bytes
font_01_sfnt_off00007416.bin
568e46dde2bd93e54ce48029ee941ed48883a71bcf9a3d03eb686bfece1a2012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7416 14320 bytes

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