Malicious PDF — malware analysis report

Static analysis result for SHA-256 795ac0345fd4e9ad…

MALICIOUS

PDF

39.5 KB Created: 2020-08-18 15:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0626c53b88f6528e92d83014872ab008 SHA-1: e1c01922c7ae1ec5b9f3e81d1c8057bcb42d72fe SHA-256: 795ac0345fd4e9ad52ee8f3a28c99651438c06224b88b3a972a1b312bdfabfd1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=ereading+worksheets+author%2527+s+purpose'. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful sites.

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=ereading+worksheets+author%2527+s+purpose
    • http://jufudiz.mariachiherenciademexico.com/uploads/1/3/0/7/130740496/lidoxodak.pdf
    • http://files.tearocksrocky.com/uploads/1/3/1/3/131381464/xijalogavuv.pdf
    • http://files.lightbringerlabs.com/uploads/1/3/1/3/131398258/ganutuvapom.pdf
    • http://files.oeorchestras.com/uploads/1/3/2/7/132710679/jobobezafetedevu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/24284099316.pdf
    • https://cdn.shopify.com/s/files/1/0437/5825/6286/files/36652103051.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/53052721133.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/84344996298.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/tiloxafivema.pdf
    • https://cdn.shopify.com/s/files/1/0433/6232/0536/files/niwoxumejomirigalulubap.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/3._5_monster_manual_2.pdf
    • https://cdn.shopify.com/s/files/1/0462/7061/1613/files/fenuxuga.pdf
    • https://cdn.shopify.com/s/files/1/0433/4069/3662/files/gibobanekonezutetorogewu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7432/1560/files/rujiwebujadekegikivube.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/pipebapojegerabat.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_off00005d22.bin
18439b283e90162ff0c237e10766cef8e216749a8ce41e42644f30ff36409a1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D22 5336 bytes
font_01_sfnt_off00006f5d.bin
703230f6a1b3d528dc57d34df1e8014171deca7dd5734efc3c4ac1e560da1220
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5D 9872 bytes