Malicious PDF — malware analysis report

Static analysis result for SHA-256 2798004de131cda3…

MALICIOUS

PDF

45.6 KB Created: 2020-09-01 15:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34c861a12d6cb476ef6c7d6bcba7b907 SHA-1: 06691a905282c3d9ef5e39fdc713c3071220843e SHA-256: 2798004de131cda3a71d775dd15e37f1ddcf2a5448ecbe1d069dd787059ee6f4
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector. The presence of numerous other links to Shopify, while some are benign, suggests a link farm strategy 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.com/wix?keyword=cross+platform+react+native
    • https://cdn.shopify.com/s/files/1/0458/1539/8566/files/inspection_checklist_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0240/4769/files/wirumaluxapilomewidobez.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7913/files/66398698961.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/werifu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7415/files/first_law_of_thermodynamics_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4044/files/5739000250.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/pennsylvania_mandated_reporter_training_requirements.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/online_translator_tamil_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8542/files/pifodif.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/sticker_cutting_images.pdf
    • https://cdn.shopify.com/s/files/1/0432/9704/6696/files/pupabu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4803/2666/files/25147801793.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/bangla_typography_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/4645/2899/files/burnout_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/terok.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_off0000699f.bin
6ef5040796fb856e5d894d46b66f6580d8e8045cf16d49cb5aefc1d61f38e16d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699F 5032 bytes
font_01_sfnt_off00007aa5.bin
da15650c041bfd14ceedc4c407ee81a520fa607e6e9607d6bfb115ca106a3c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA5 9612 bytes
font_02_sfnt_off00009b74.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B74 4324 bytes

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