Malicious PDF — malware analysis report

Static analysis result for SHA-256 f467b314b9086709…

MALICIOUS

PDF

46.4 KB Created: 2020-08-05 08:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07d2d6c1a64e6b7f1ce7225beafd8ca4 SHA-1: 173845332845de1452316803ffd090254e7937d7 SHA-256: f467b314b908670938e43abddcbc3954fcbbeb17d7eb3016909946813449a12e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external resources. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to ttraff.ru, a known malicious redirector. The PDF_SEO_LINK_FARM heuristic indicates a link farm structure, suggesting the document is designed to drive traffic to various sites. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to IELTS reading tests and URLs, reinforcing the lure.

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=ielts+reading+general+practice+test+pdf+2020
    • http://files.mythicfirecreations.com/uploads/1/3/0/7/130776008/tawalo_temiduwulokife_rabovozasufelu_mafesitipalux.pdf
    • http://files.jacquilhershberger.com/uploads/1/3/0/7/130739202/1819899.pdf
    • http://files.glassbrookvocal.org/uploads/1/3/0/9/130969469/3547996.pdf
    • http://pafevu.judithfishercentre.com/uploads/1/3/2/7/132740435/9de593e7c70275.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/72874103910.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/pegax.pdf
    • https://cdn.shopify.com/s/files/1/0436/2731/5353/files/15004519890.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/josuzure.pdf
    • https://cdn.shopify.com/s/files/1/0429/6382/8895/files/jozogugud.pdf
    • https://cdn.shopify.com/s/files/1/0428/1889/6038/files/25995044824.pdf
    • https://cdn.shopify.com/s/files/1/0436/9291/6886/files/vajuwadatoxuxemu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/72163416158.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/babunarevik.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/free_download_buku_agama_islam.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/10315039787.pdf
    • https://cdn.shopify.com/s/files/1/0436/1509/2894/files/attachment_theory_adults.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4993/files/3934791784.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076e5.bin
54137e8f5029cc1ca05a252e5acf7c6f65f364586045a2f76523c5daae844ec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E5 5532 bytes
font_01_sfnt_off000089cb.bin
c606939a5761f68be53a2f746142a9a63ca493d86b9c5550af87dad6aba2209f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CB 10240 bytes

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