Malicious PDF — malware analysis report

Static analysis result for SHA-256 117ce8840fec9ef9…

MALICIOUS

PDF

50.6 KB Created: 2020-07-31 10:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 131c527cdc7f3a34580c2abaf9e42707 SHA-1: 054472b6589a39ece3a72edb03a7864ca6fe3141 SHA-256: 117ce8840fec9ef9942df19690e31f08f098d3b811e4bec4ead113278fdccc1d
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link redirects to a known malicious domain. This suggests a link farm or SEO manipulation tactic to disguise the malicious intent. The document body, though heavily obfuscated, appears to be a lure related to ukulele chords, likely to trick users into clicking the malicious link. No scripts were extracted, but the presence of embedded URLs and the heuristic firings strongly indicate a redirection-based attack.

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=ukulele+chord+chart+for+beginners+pdf
    • http://files.true-leaf.net/uploads/1/3/2/6/132695832/nonavotexavodivol.pdf
    • http://files.beulahmay.com/uploads/1/3/0/7/130775156/6502161.pdf
    • http://files.cooperlaifineart.com/uploads/1/3/1/4/131437474/dudidabenefip.pdf
    • http://files.englishbyosmosis.com/uploads/1/3/1/3/131379382/morip-totuzar-ziludasu-pewajuvel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0737/7567/files/womojovufipamuloxas.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/66680249909.pdf
    • https://cdn.shopify.com/s/files/1/0432/0342/8510/files/tixujakozutewesasoxujiwo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0923/files/wetupevifaxigalajaximalet.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3039/files/jabibepoxatesoxafufu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/91779881154.pdf
    • https://cdn.shopify.com/s/files/1/0441/2401/2696/files/kilabad.pdf
    • https://cdn.shopify.com/s/files/1/0429/3427/2163/files/rigerewarilefuma.pdf
    • https://cdn.shopify.com/s/files/1/0430/2582/5955/files/dubuzituvevib.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8661/files/tinizelutewejokin.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/munedosajulalilinodijeza.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/limepu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/22611208544.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_off00008808.bin
36ef88b5b0108e35f65a8f433ccce6f1cacea2992824c69319f52ac54b05345b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8808 5492 bytes
font_01_sfnt_off00009aa6.bin
522dce88353fb38456daefac0bab6deb2e7ca435ceb2747be3c91a67c5d1d8d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA6 9996 bytes

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