Malicious PDF — malware analysis report

Static analysis result for SHA-256 826e9dbfd70f3e2d…

MALICIOUS

PDF

42.8 KB Created: 2020-08-19 16:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caac2c6121c4fb233b23850c730e10ad SHA-1: 663fe79b97e449f3c239c87df3cc6808515f80a0 SHA-256: 826e9dbfd70f3e2da7e4c1a3b039c24e9ab0ad79de5f3daef096b113d867eb06
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning model and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.cc/pify?keyword=bluetooth+low+energy+android+tutorial, which likely serves as a gateway to further malicious content. No scripts were extracted, limiting the analysis of direct execution behavior.

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=bluetooth+low+energy+android+tutorial
    • http://files.nathanielpicardbusky.com/uploads/1/3/2/6/132681192/wuwotutute.pdf
    • http://lesoluj.hythummusic.com/uploads/1/3/0/7/130776078/sugalowusi_zezevopuvuj_papaxegemuweri.pdf
    • http://files.teamelmnj.com/uploads/1/3/0/8/130874192/lisopigijigebolilax.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/cpu_addressing_modes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/bisimuwilido.pdf
    • https://cdn.shopify.com/s/files/1/0433/7421/5331/files/kigepenif.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/80710430677.pdf
    • https://cdn.shopify.com/s/files/1/0437/4288/8097/files/26047797337.pdf
    • https://cdn.shopify.com/s/files/1/0449/8427/1016/files/86542255394.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/63094736812.pdf
    • https://cdn.shopify.com/s/files/1/0439/7514/7678/files/rouleaux_formation_and_agglutination.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4542/files/spring_framework_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/0242/0644/files/rikepa.pdf
    • https://cdn.shopify.com/s/files/1/0439/0954/6136/files/ap_world_history_exam_answers.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_off00005cbc.bin
3c830acba80c860b2269432ccd64019c63ef4d328b997106d7903f16e46824d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBC 5032 bytes
font_01_sfnt_off00006de1.bin
b2ba3dc47697e86abab050e80d0416d0442af511046c41c9bcf42c60375eb4c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE1 9972 bytes
font_02_sfnt_off00009019.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9019 4324 bytes

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