Malicious PDF — malware analysis report

Static analysis result for SHA-256 d375ae5fb48b6570…

MALICIOUS

PDF

33.9 KB Created: 2020-08-30 10:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb834694fec98158dfe5de0c6ba894f4 SHA-1: 71496dcbbc877fea0d45d601db84b265a5eb78d0 SHA-256: d375ae5fb48b6570a54adf0e6ef2fef9531abc0bfdaeddbe54a87d318c195998
150 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though partially corrupted, includes text suggesting it is a 'Frigidaire top load washer repair manual', which is likely a lure to entice users to click the malicious URL. The presence of numerous other links, many hosted on Shopify, indicates a link farm designed to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=frigidaire+top+load+washer+repair+manual
    • https://cdn.shopify.com/s/files/1/0439/3045/2123/files/tizapikixapu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5371/0493/files/grief_and_loss_for_youth.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/82204566196.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/23631881817.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4637/files/rolelaloviwumidiwimed.pdf
    • https://cdn.shopify.com/s/files/1/0428/5884/0223/files/chromosomal_abnormalities_and_genetic_counseling.pdf
    • https://cdn.shopify.com/s/files/1/0435/6135/3371/files/banned_books_challenging_our_freedom_to_read.pdf
    • https://cdn.shopify.com/s/files/1/0428/6133/0598/files/carte_des_espaces_agricoles_en_france.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/dofubavaziverok.pdf
    • https://cdn.shopify.com/s/files/1/0434/3388/5846/files/pololesovamofokaxeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/56612372418.pdf
    • https://cdn.shopify.com/s/files/1/0438/0885/0081/files/engineering_technology_practical_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/4301/2256/files/96190329299.pdf
    • https://cdn.shopify.com/s/files/1/0438/5737/9488/files/21518180512.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/68507662747.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/complete_neuro_exam_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/2823/1830/files/wulesuzibifekawetunadilun.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_off00004780.bin
169378773c50f9361b32b791603e3c1c8295542fd12117da8d35817a320c88e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4780 5420 bytes
font_01_sfnt_off000059d1.bin
51b1f010cb3e8ce2493112aa06d54d855f4d04654887ead608c70d73f4ed3fa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x59D1 9688 bytes