Malicious PDF — malware analysis report

Static analysis result for SHA-256 09936279b8ccc4e0…

MALICIOUS

PDF

63.9 KB Created: 2020-07-29 23:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f9297227b67c353d43ad5238b03e42b SHA-1: 31d1611169e65870cd8f2a324cfbc330ad2378f0 SHA-256: 09936279b8ccc4e0949bc53c2612084940ca66fbe399e85dc4be4e5daa4a3923
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious URL, 'https://ttraff.cc/pify?keyword=angka+dalam+bahasa+arab+pdf', is flagged as a redirector to malicious infrastructure. While no scripts were extracted, the structure and embedded links strongly suggest a malicious intent to redirect users, likely for phishing or to serve further malware. The ML classifier also strongly indicated maliciousness.

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=angka+dalam+bahasa+arab+pdf
    • http://files.sanctuaries.org/uploads/1/3/1/8/131856443/jebegesogitesol.pdf
    • http://files.commafultips.com/uploads/1/3/2/7/132712006/bejirajut_pezekuzeroz_rifikudo_geroromewav.pdf
    • http://files.hopecounseling.org/uploads/1/3/1/6/131607237/1fbb0437310644.pdf
    • http://files.lewisandclarkdiscgolf.com/uploads/1/3/0/7/130775027/zipapul.pdf
    • http://files.salisburysdachurch.org/uploads/1/3/2/7/132740536/f4a5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/nafokeloxazositaveju.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/91350931918.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34680977850.pdf
    • https://cdn.shopify.com/s/files/1/0438/0606/4801/files/56688446402.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/jaforukusirogixumazuwadul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/taridulozomoxekolakinuku.pdf
    • https://cdn.shopify.com/s/files/1/0428/6939/1527/files/14218388549.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/gutazofeku.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1661/files/zexiguxodolavulazitesobiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/34661459707.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0000c3b3.bin
309bcecdce5431ba9609c741149902aa6ad387557bf38ac0c901c79146e3fab7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC3B3 20348 bytes
font_00_sfnt_off0000880b.bin
bdf2f943a6c25afb457d3cba5251eed9d5db2fe44a947e12f52fb08999fb4067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x880B 5080 bytes
font_01_sfnt_off00009905.bin
d9f9f511b75697e0cb13baf700acd3365e54df93360eab587371126b3dd5b79d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9905 13424 bytes
font_03_sfnt_off0000e622.bin
233f555e5908dcc516d1ff8e5d68f3640f8b77796c591f691e240338392e8ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 2332 bytes

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