Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a0d75072ce614b…

MALICIOUS

PDF

43.6 KB Created: 2020-08-06 19:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c9302fed088c7ec205b61b96ace421c SHA-1: 21e490a93992f327084cbe49f5d7edae99ee762b SHA-256: 17a0d75072ce614b9bdc051ee885dda06135068e59c2af6c63adb6ed6e761358
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though garbled, includes the URL for the malicious redirector, suggesting an attempt to disguise malicious activity as a legitimate PDF download. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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.com/pify?keyword=difference+between+arteriosclerosis+and+atherosclerosis+pdf
    • http://files.ruthnadiamassage.com/uploads/1/3/0/8/130874050/dowemawuxekavojuse.pdf
    • http://files.nxtgenerationenergy.com/uploads/1/3/2/7/132740415/sodegebu.pdf
    • http://files.alaskarvadventures.com/uploads/1/3/2/6/132681336/fdfd3d.pdf
    • http://files.quieteroahu.com/uploads/1/3/0/7/130738553/tojak.pdf
    • http://files.debadavis.com/uploads/1/3/0/7/130738848/wisexo-ditilerexoleb-rukuzo-dugolezudoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4493/7628/files/comfort_colors_swatches.pdf
    • https://cdn.shopify.com/s/files/1/0433/2106/5640/files/profanations_giorgio_agamben.pdf
    • https://cdn.shopify.com/s/files/1/0434/2530/0647/files/mips_to_binary.pdf
    • https://cdn.shopify.com/s/files/1/0440/3760/3478/files/poxabagizipibobavevukiwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8765/files/grammar_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8419/files/10494974623.pdf
    • https://cdn.shopify.com/s/files/1/0435/2668/4824/files/97428561945.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/355516781.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/disappointed_face_meme.pdf
    • https://cdn.shopify.com/s/files/1/0446/7530/1539/files/genetic_algorithm_neural_network.pdf
    • https://cdn.shopify.com/s/files/1/0434/6612/9574/files/sozobidawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0755/7275/files/80211894128.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_off000068f3.bin
256c7be01459714915ebb9c5c60d66207d789843195fc34f8ff3ee2b0058c656		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F3 5472 bytes
font_01_sfnt_off00007ba1.bin
bd7ee7ae9bd8a17cbf543f829973676531d67c86e44cc86ddc16a89ea7bea495		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA1 11020 bytes

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