Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa62caa7b6a7895…

MALICIOUS

PDF

49.0 KB Created: 2020-07-29 22:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4967f9aeeb2b3aee643615c7b2571eb0 SHA-1: 7854ab883b6b23ac913bdcfaae21f8be4a736b23 SHA-256: 0aa62caa7b6a7895a3cb0eb82ff27f6753a2f88dc9acb9d30247dca569fdd597
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of numerous links, including to Shopify domains, suggests an attempt to obscure the final malicious destination and potentially engage in SEO manipulation for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious link farm.

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=s%25E1%25BB%25ADa+file+pdf+b%25E1%25BB%258B+ng%25C6%25B0%25E1%25BB%25A3c
    • http://files.incanonmedia.com/uploads/1/3/1/3/131380163/zomomadutoluba_kupazijeganifis_kubiwereg.pdf
    • http://files.schoolstaffsafeguardingquiz.co.uk/uploads/1/3/0/9/130969470/5524173.pdf
    • http://files.ladancestudio.com.au/uploads/1/3/1/3/131380263/tabegoxag.pdf
    • http://files.srrlsf.com/uploads/1/3/1/3/131380868/4f04903295aa5.pdf
    • http://files.sikhsaaj.com/uploads/1/3/0/9/130969708/fukinokola-lomavezikasakam-bepatamirul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5955/2166/files/sigiduzokebefesenab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1765/files/felotuvoneseda.pdf
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/jiwiwunogugevelebor.pdf
    • https://cdn.shopify.com/s/files/1/0431/3523/8301/files/26184887059.pdf
    • https://cdn.shopify.com/s/files/1/0438/3087/0173/files/wowimuledoxulowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5637/files/bemitubuxe.pdf
    • https://cdn.shopify.com/s/files/1/0438/4748/3557/files/55400645226.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94215193789.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006937.bin
9d7ae77a1a636e5e3b53175d8ac5da46c81d1977c2ade17d92d8718aa714a71e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6937 5436 bytes
font_01_sfnt_off00007b58.bin
d5e606a80e6babd42c3abc034f3ca83818eb72d6e533a5363185b7ca738680a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B58 10980 bytes
font_02_sfnt_off00009f8b.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F8B 16204 bytes

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