Malicious PDF — malware analysis report

Static analysis result for SHA-256 413050267401a80a…

MALICIOUS

PDF

42.4 KB Created: 2020-08-08 17:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 399b70e4de48d3850201641de2384abe SHA-1: d8dc34259f115e693647e4135a3d1a9090c984ff SHA-256: 413050267401a80a3f86085c3361ca51f8794f394d32aa9611c17805eee8cf9c
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous embedded links, a technique often used for SEO spam or to redirect users to malicious sites. One of the embedded URLs, https://ttraff.ru/pify?keyword=aloe+vera+nombre+cientifico+pdf, is flagged as a known malicious redirector. The document body itself is heavily obfuscated and contains references to the URLs, suggesting a lure to external 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.ru/pify?keyword=aloe+vera+nombre+cientifico+pdf
    • http://files.bluesteelmfg.com/uploads/1/3/1/4/131407855/funim_kifixevig_vonaxapozuwa.pdf
    • http://files.slodivers.com/uploads/1/3/0/8/130874067/juwowipabo.pdf
    • http://files.ebrahimkhanilab.com/uploads/1/3/1/3/131381802/1b2759dd.pdf
    • http://files.aispng.org/uploads/1/3/2/6/132695445/4749289.pdf
    • http://files.swta-cta.org/uploads/1/3/1/1/131164117/zufug_kamuvuwa_piguxo_xubarorugefote.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/74319373507.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3557/files/banting_weekly_meal_plan.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1911/files/68177095160.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/16167361145.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/2893048308.pdf
    • https://cdn.shopify.com/s/files/1/0427/9799/0055/files/vifuzu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5478/3893/files/litokinuvirigiz.pdf
    • https://cdn.shopify.com/s/files/1/0441/0051/8040/files/8087813589.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/74020606830.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3893/files/discounted_payback_period_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/algebra_and_trigonometry_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/5733/2895/files/83367885141.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/45026854113.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_off0000646d.bin
a41e6aedc8000f6294258d8d099fdc3ebf2b6cd3fd331e7a6e2bbe5254c4bc30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646D 5312 bytes
font_01_sfnt_off00007672.bin
92e74eee761c89d1ff20c9dc08eef8e846685ff2184ca4f1ac536803cbb21f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7672 11248 bytes

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