Malicious PDF — malware analysis report

Static analysis result for SHA-256 da57e88f5ef2bb66…

MALICIOUS

PDF

48.3 KB Created: 2020-08-10 20:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 170fc423882938d7cb2cb057f17f106b SHA-1: 4f36572c2f72bbbc120dbd4c7e14bbeb8fe7f524 SHA-256: da57e88f5ef2bb66de146a5985b52511534bb97539b3f4facc98d0b7bd33e804
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as academic gate books. The document body also contains numerous links to other PDFs hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. No scripts were extracted, but the presence of the malicious redirector and link farm strongly suggests a phishing or scam attempt.

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=ace+academy+gate+books+pdf
    • http://files.c2.ie/uploads/1/3/1/6/131636914/a023c67b6aad4.pdf
    • http://files.elizabethart.net/uploads/1/3/0/7/130775245/fe848e.pdf
    • http://susivuru.crowsmoon.com/uploads/1/3/1/3/131383483/dunufunovuta.pdf
    • https://cdn.shopify.com/s/files/1/0432/0008/6180/files/28368793322.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/alexa_skills_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/kimupavoxisujutudukix.pdf
    • https://cdn.shopify.com/s/files/1/0432/6614/6472/files/vazopujovurede.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/7489501842.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bisadugizutojaririxenudep.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/55566065094.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/kigunulosovudu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/the_legend_of_zelda_ocarina_of_time_3ds_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/beowulf_characters.pdf
    • https://cdn.shopify.com/s/files/1/0428/8646/3647/files/21413374453.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dcc.bin
772bbd36abd63a3161e247431c0f0b1f4b9f8a982cdc7400a74387e041b5d4b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCC 5640 bytes
font_01_sfnt_off000070f6.bin
e4ae6767ffa4e17bd57d98216adfa57e758af99d5d7909c480ac39a6ef5e21dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x70F6 14532 bytes
font_02_sfnt_off00009f0e.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F0E 16164 bytes