Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6b8a701207c099…

MALICIOUS

PDF

55.6 KB Created: 2020-08-14 00:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1007fe101512e5e4ec7455c530543433 SHA-1: 01b509146cd3ce8649cae683fb7ef73bdf0f0bbc SHA-256: ad6b8a701207c099924260c57ba7a7caff6d496c2581924267e8835963334d9f
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=explorers+of+sky+level+guide'. Another heuristic identified a PDF link farm with 16 external links, many hosted on Shopify, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The document body contains garbled text but includes the same redirector URL, reinforcing the malicious intent.

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.ru/pify?keyword=explorers+of+sky+level+guide
    • http://files.cfapsl.com/uploads/1/3/0/7/130739718/zukokipijasiza.pdf
    • http://files.blueridgetu.org/uploads/1/3/0/7/130776763/4507603.pdf
    • http://files.exposingtheelca.com/uploads/1/3/0/8/130874110/d08531e6.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/29529548820.pdf
    • https://cdn.shopify.com/s/files/1/0432/2089/3851/files/53811829570.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/rainbow_frog_meme.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2496/files/lulup.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/makelivefag.pdf
    • https://cdn.shopify.com/s/files/1/0440/6778/2821/files/mabakomorogutuvip.pdf
    • https://cdn.shopify.com/s/files/1/0437/0916/9815/files/zexumekezedukuvax.pdf
    • https://cdn.shopify.com/s/files/1/0436/0906/3586/files/joniwaxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/morunitigikiwijep.pdf
    • https://cdn.shopify.com/s/files/1/0432/8384/1190/files/77378151535.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/college_physics_volume_2_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/company_catalogue_design.pdf
    • https://cdn.shopify.com/s/files/1/0431/7052/9436/files/nejuwavalus.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f8e.bin
b1a40e151c7456c094ce3e41768330fcd4c378e541a0de0217d1637c5fd96e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8E 7004 bytes
font_01_sfnt_off0000876d.bin
a578d5471d1250604fab61a8440e39753617137a80c3e30349f1b8ec96969ab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x876D 4948 bytes
font_02_sfnt_off00009866.bin
88110b24fdd582cf6f470c940bbfe5efffbac3ac6e76be29efc7d4f4b50a5130		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9866 13568 bytes
font_03_sfnt_off0000c2d4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D4 4324 bytes

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