Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8b5336cf35b8e2…

MALICIOUS

PDF

35.8 KB Created: 2020-08-06 03:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb8107b4ec1bd3db309d149bf8b64c13 SHA-1: 23ad0f59bf40f2a2ac5ead99076a8c4376cf745f SHA-256: 8a8b5336cf35b8e2376dcb5dcf4bedbcffb5c22cfe9f0543693c23f4b83246aa
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=adverbs+of+frequency+exercises+for+beginners+pdf'. The document body, though heavily obfuscated, contains text related to 'Adverbs of frequency exercises for beginners pdf', suggesting a lure to disguise the malicious links. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm designed to attract traffic to malicious destinations.

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.ru/pify?keyword=adverbs+of+frequency+exercises+for+beginners+pdf
    • http://files.batrssocal.com/uploads/1/3/1/3/131384789/vipibifoxoteroxu.pdf
    • http://tubizu.legendarystrengthgym.com/uploads/1/3/1/3/131381078/lokugidu_resalafeloxoli_tetusuvunav.pdf
    • http://files.arealisticplan.com/uploads/1/3/0/7/130775977/jebizewel_rifasor_kivifo_moboguzux.pdf
    • https://cdn.shopify.com/s/files/1/0436/3694/9152/files/ip_man_english_dub.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/nizazep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/julanefiwozuxam.pdf
    • https://cdn.shopify.com/s/files/1/0433/5167/0943/files/sozukovobogosidewe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4501/1112/files/77464063877.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/cantaloupe_island_tabs.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/giwebegukifev.pdf
    • https://cdn.shopify.com/s/files/1/0434/9850/4354/files/rofam.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7223/files/fuwetiginatuli.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/92598565513.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/migixiwozas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gokibaleginasesomedusuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/22078551112.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_off00004d58.bin
94bdacbeb878d97ef2ca804fb603b7054492bf8918f6263192bba0586865b5a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D58 5568 bytes
font_01_sfnt_off0000605c.bin
53701f445153bd0f93f712efb1fad8baf0fe6f450178c2ab85c23afeec4aea4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x605C 9884 bytes