Malicious PDF — malware analysis report

Static analysis result for SHA-256 78729593ffea57e8…

MALICIOUS

PDF

43.2 KB Created: 2020-07-25 01:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1128a1eed97975cb0cde5981928c865 SHA-1: 7adcab60c93058c5cfd25f5a05d83244e21245fd SHA-256: 78729593ffea57e8fed91c34ceaff474e21c12ed1a30659ea3b33c5872318c40
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. It also exhibits PDF_SEO_LINK_FARM behavior, suggesting an attempt to generate traffic through numerous external links. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of malicious redirector links is sufficient evidence of a phishing or scam attempt.

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=realsoft+attendance+software+10.+7
    • http://files.fchseagleband.com/uploads/1/3/0/7/130739073/3dd50.pdf
    • http://files.thelogcottage.co.nz/uploads/1/3/1/0/131071063/tutaniwanijoru.pdf
    • http://files.packupallyourdishes.com/uploads/1/3/1/6/131606284/filisekawiso_bilifaxa_puged_gibeliroturu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/sanofatinivutukal.pdf
    • https://cdn.shopify.com/s/files/1/0429/4000/6559/files/jomumopamitom.pdf
    • https://cdn.shopify.com/s/files/1/0429/0497/7564/files/wusubodibijubodukirufed.pdf
    • https://cdn.shopify.com/s/files/1/0432/5444/8286/files/wusixapegapajowedopejave.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/temedugoda.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7367/files/89545222005.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/rumuxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/48229145987.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1070/files/fedazajefun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/83834695420.pdf
    • https://cdn.shopify.com/s/files/1/0435/9372/8158/files/59071794754.pdf
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/51646850770.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/kirokabomi.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_off00006af1.bin
5fbec45af2d3721eec7f5710d1c732932dbfbb02607825335f47d7a8531db493		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF1 5160 bytes
font_01_sfnt_off00007ca8.bin
f2d418f0df96b4d6839241988efc21911020587a4a194ba92218b61c1c9ef7f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA8 10308 bytes

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