Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cdf36c3362a07f…

MALICIOUS

PDF

41.0 KB Created: 2020-08-12 23:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1414ca891896d9592e14c4be9fc1f413 SHA-1: b683adcc0b1b94e45182f2b19b78fc1ed731ca43 SHA-256: 22cdf36c3362a07fce9766223ff699a0471f8df13c29d19448c06d838f361c7e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=survival+analysis+techniques+for+censored+and+truncated+data+pdf', indicating an attempt to lure users to malicious infrastructure under the guise of providing a document on survival analysis techniques. No scripts were extracted from this sample.

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/pify?keyword=survival+analysis+techniques+for+censored+and+truncated+data+pdf
    • http://files.simvs.com/uploads/1/3/1/4/131482950/c1a20452ebf35.pdf
    • http://lumozi.fariyadoctor.com/uploads/1/3/2/7/132710797/rowevapinanoje.pdf
    • http://rokaxu.basementcityproductions.com/uploads/1/3/1/0/131070722/ralibufiwo_sagab_lupujoreke_jopukixini.pdf
    • http://files.thistallawkwardgirl.com/uploads/1/3/1/4/131452938/manosixisuxojisabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6262/files/xesogazulezosazipiluw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/skyrim_key_helper.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5081520916.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/abdomen_agudo_medico_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/6559/8364/files/5548054541.pdf
    • https://cdn.shopify.com/s/files/1/0431/6030/5825/files/85719784321.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9839/files/tudujuxujenivorapoga.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/paranoia_agent_blu_ray.pdf
    • https://cdn.shopify.com/s/files/1/0437/8689/5522/files/o_level_african_history_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/maxofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/jukuzejavizaje.pdf
    • https://cdn.shopify.com/s/files/1/0434/0544/3233/files/gumam.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_off000061d0.bin
ca847a3428eac4e92f7bbd543fe42b50c0ffd314483ab2561d3f817c05ca99e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D0 5636 bytes
font_01_sfnt_off000074fb.bin
aedf39cf1710e7026a04b3acb5090da0d943b46659ca890439410b3b39549266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FB 9888 bytes

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