Malicious PDF — malware analysis report

Static analysis result for SHA-256 047d70d8df6c032c…

MALICIOUS

PDF

36.7 KB Created: 2020-08-24 06:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b66c4fc44f23888984fd37acb4bfea3 SHA-1: 7ee37f21468fa7b2bb8711cab8c004d52007f8cf SHA-256: 047d70d8df6c032cfedcf7c694ac585da9dae564d119a03a6da0a5d388c61c4a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain, ttraff.ru. The document body, though heavily obfuscated, contains the string 'https://ttraff.ru/pify?keyword=free++action+movies+full', indicating a lure to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=free++action+movies+full
    • http://files.studiosmdesign.com/uploads/1/3/1/3/131381363/nusaku-subizabogaxetas.pdf
    • http://bowotir.nlascouting.org/uploads/1/3/2/8/132814930/b525c.pdf
    • http://files.themindfulmilspouse.com/uploads/1/3/1/3/131381021/8594970.pdf
    • http://files.cherylanncooke.com/uploads/1/3/1/3/131383283/6472422.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1718/2104/files/rusukilujapenevijibadulet.pdf
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/1258342411.pdf
    • https://cdn.shopify.com/s/files/1/0455/6374/0325/files/91120228519.pdf
    • https://cdn.shopify.com/s/files/1/0432/1656/8482/files/zobuvebimisojo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/77427889549.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/ginurivotapidexogojep.pdf
    • https://cdn.shopify.com/s/files/1/0437/2643/8550/files/32002883559.pdf
    • https://cdn.shopify.com/s/files/1/0429/5625/9491/files/android_alertdialog._builder_button_color.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/oblivion_sheet_music_flute.pdf
    • https://cdn.shopify.com/s/files/1/0441/0333/6088/files/introductory_biomechanics_from_cells_to_organisms.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_off00004736.bin
90cd9ca499acac910992c0a6c2eca2430d40644037e89bc9657a29279635649b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4736 5044 bytes
font_01_sfnt_off0000584c.bin
485e8c7bff86c84d150bf51a694e812d6591102048f05837837845dc56521f45
pdf-font-stream PDF embedded font (sfnt) at offset 0x584C 14216 bytes