Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d3d14b4f7458ed…

MALICIOUS

PDF

42.0 KB Created: 2020-08-24 05:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e46463cd5a741e36b8b5c43ad494922 SHA-1: 759b6d46517a8daf4f1de96ede74b670e3e7895d SHA-256: 13d3d14b4f7458edb778bc99a2b5c9c434f9bc5e3b376d4e5f92fa51c086deeb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely intended to lead the user to malicious content, potentially as part of a phishing or scam campaign.

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.cc/pify?keyword=scrabble+word+dictionary
    • http://files.friendsofcharliesplace.org/uploads/1/3/1/1/131163578/3697682.pdf
    • http://files.muttsearmitts.com/uploads/1/3/2/7/132740424/rofizilowe-fiminiwejeze-gekikeme-kamowigubegeke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2304/8610/files/can_you_feel_the_love_tonight_flute_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/2974/2246/files/kerijon.pdf
    • https://cdn.shopify.com/s/files/1/0438/9568/5288/files/22329456926.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4079/files/lexezugevupubidipugi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5395/7799/files/lojidekalilov.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3308/files/razuwexobijagameropezi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8102/files/62889637276.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8701/files/valorisation_du_caroubier.pdf
    • https://cdn.shopify.com/s/files/1/0435/3110/8504/files/riviter.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7207/files/molecular_genetics_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/0107/0247/files/wazekazebubuzakuwusu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/55492529877.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/camera_shots_and_angles_quiz.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066a2.bin
17ab8a00b9c767573eea6c71ab859e765ab3717e4f8cadc7c46a49cbbdefd160
pdf-font-stream PDF embedded font (sfnt) at offset 0x66A2 5192 bytes
font_01_sfnt_off00007866.bin
3c7fe6886506b3313f9cb4a01c7701d4174c3ebbc5f1a01a60ce06c2ca677e4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7866 10248 bytes