Malicious PDF — malware analysis report

Static analysis result for SHA-256 793e362058fc5522…

MALICIOUS

PDF

53.8 KB Created: 2020-08-06 04:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010f71ec33ceaee346d71f7de064319d SHA-1: b41beac7af4bb5b856624c2c64a88eea7eea990c SHA-256: 793e362058fc55227a03c6a22e73a84e760329ce4b208e5e596a57c27d81b039
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector (ttraff.cc), and is flagged by heuristics for malicious redirector links and SEO link farming. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and IOCs, suggesting a lure to a malicious site. No scripts were extracted, but the presence of embedded URLs and the ML classification strongly indicate malicious intent.

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=bhutan+travel+guide+pdf
    • http://files.chfsrbija.org/uploads/1/3/1/3/131380158/zavajud_suxedes_mesof.pdf
    • http://files.sansmarket.co/uploads/1/3/0/7/130740521/bitupenamitede.pdf
    • http://files.drpatriciafrischtak.com/uploads/1/3/1/8/131856039/nakivolo.pdf
    • http://files.folkloreandfern.com/uploads/1/3/1/0/131070202/botemokisekep-gesumajumigiw-meteziwe-dewija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/xoxuxexuvuzikonevifore.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6846/files/8120116129.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/fimig.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7642/files/97123131602.pdf
    • https://cdn.shopify.com/s/files/1/0439/2232/5672/files/past_simple_regular_verbs_esl.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/91607740202.pdf
    • https://cdn.shopify.com/s/files/1/0440/4009/3846/files/unity_vertex_color.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/91563395639.pdf
    • https://cdn.shopify.com/s/files/1/0435/3887/4532/files/proverbs_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9724/4316/files/fisuzutorus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tizerosotusalasebix.pdf
    • https://cdn.shopify.com/s/files/1/0432/5166/3012/files/buchungsstze_bungen_mit_vorsteuer_und_umsatzsteuer.pdf
    • https://cdn.shopify.com/s/files/1/0437/2925/6602/files/fallout_4_mod_list.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_off000093da.bin
0b8cb8d0db80803664c55150a13947c13e460743ce4f1ea96fd1f652a5114b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93DA 5232 bytes
font_01_sfnt_off0000a5ad.bin
c804803f1f2ccd24e94f1f0049f6828219e5f376969bae9d753ce6b9ea0f65ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5AD 10688 bytes

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