Malicious PDF — malware analysis report

Static analysis result for SHA-256 771d909f47fd9591…

MALICIOUS

PDF

64.6 KB Created: 2020-08-23 01:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a1b415615207bfbb4502cfd7fb1f292 SHA-1: 4546b4969881599c20b68e66f1eb6408ce49abfe SHA-256: 771d909f47fd95918def401696e1e8f18d460196a44c3c0f74f17035312f5d09
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 identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or direct users to malicious sites. 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.ru/pify?keyword=bajrang+dal+dj+song++2017
    • http://nulutet.jowensmithmusic.com/uploads/1/3/1/0/131070036/fexixatisapemetosuxe.pdf
    • http://files.katycupcakes.com/uploads/1/3/2/6/132695339/zamen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0434/4188/1253/files/sejobolepejojigulipeba.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/fatakufowekitowuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6645/files/sundered_mini_boss_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/6879/0686/files/96465142886.pdf
    • https://cdn.shopify.com/s/files/1/0454/3496/2088/files/juxemuxo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0987/files/all_physics_formulas_for_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9267/files/nevotepilevusema.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/44819866756.pdf
    • https://cdn.shopify.com/s/files/1/0434/6583/4649/files/kelubopumu.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d08.bin
0b5e2232e287906fa69f7cdc51ab19c8c92147b2e4fba8c5edcc65ed17d50ef2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D08 3064 bytes
font_01_sfnt_off000067d3.bin
916f9d1183a24492527d500c5578b6fdce5ec2b5470a40c12b37ab6c23cf031a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D3 5524 bytes
font_02_sfnt_off00007aa7.bin
951459aa7c486cbeea45526d1ccc09e3afbbafc4c26be26311a9228dadeee13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA7 6052 bytes
font_03_sfnt_off0000901e.bin
3eb2bff89001e779664dd0fd98d30a748a75e020c9c658ffc663917f9a18ccb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x901E 15524 bytes
font_04_sfnt_off0000c06a.bin
f49a6853164f1f5acb3347c8a0bfa65f72c450cb661f9fd060f3baac1277eda3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC06A 19000 bytes
font_05_sfnt_off0000dee5.bin
eaf17523b4eb1cce9202c176869db8dcf0cddd400e23c8048322c979b59c416f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 5416 bytes

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