Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e88795ca1527a3d…

MALICIOUS

PDF

41.2 KB Created: 2020-08-21 00:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec97592416980c574df7bdeb312f789c SHA-1: 1c0a1d1e0fa4d725602ef1de87e418c35f72f1ba SHA-256: 3e88795ca1527a3d136f6dfd4d98a9df4d175a7b7c5914eec8327e03eab3cbca
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is disguised as 'balancing equations practice problems with answers'. This indicates a social engineering lure to redirect the user to malicious content. The document also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to distribute the malicious content. No scripts were extracted, but the primary attack vector appears to be the malicious URL embedded within the document.

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=balancing+equations+practice+problems+with+answers
    • http://files.tonyottenauthor.com/uploads/1/3/1/4/131453924/847da69e.pdf
    • http://files.madronacompany.com/uploads/1/3/2/3/132302871/gafuninek.pdf
    • http://gepuzobi.danecountymedicalsociety.org/uploads/1/3/2/8/132814930/difij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/sutimawarib.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/reported_speech_mixed_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/2236/0469/files/radivejapemokagotudik.pdf
    • https://cdn.shopify.com/s/files/1/0435/6112/4008/files/parkour_minecraft_servers.pdf
    • https://cdn.shopify.com/s/files/1/0437/9777/4497/files/naruto_shippuden_storm_4_apk_mod.pdf
    • https://cdn.shopify.com/s/files/1/0434/2690/6264/files/23876411856.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5885/files/49691140504.pdf
    • https://cdn.shopify.com/s/files/1/0435/6371/2671/files/87249156151.pdf
    • https://cdn.shopify.com/s/files/1/0435/8042/4351/files/80812116921.pdf
    • https://cdn.shopify.com/s/files/1/0431/9785/7954/files/49025291528.pdf
    • https://cdn.shopify.com/s/files/1/0443/9041/6550/files/celebrate_recovery_study_bible.pdf
    • https://cdn.shopify.com/s/files/1/0438/1537/0912/files/lopisoboxo.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_off000060ca.bin
cfc84b21b43a9274a05c80daaf28624a2c3db55af18c63cda54b5b49a34bd7b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60CA 5756 bytes
font_01_sfnt_off00007435.bin
ec65faab9a963e815a0c246d3963e0a5f9aadc3e7d25651fce1b8ad5b55d00a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7435 9840 bytes

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