Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7b4c6eaf9f0d50…

MALICIOUS

PDF

48.6 KB Created: 2020-08-29 09:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2146f75f4646a522e801a7daaac6c6c6 SHA-1: 91e21f54d9e7d224912de153296c8b8c9347b77c SHA-256: ac7b4c6eaf9f0d50f1245175ad861a1d467bbf70ade4842cfd1eb8abe401b6cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same redirector URL. The presence of numerous links to Shopify PDFs suggests an attempt to blend in with benign content while directing users to malicious 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/wix?keyword=ablaze+el+color+que+cambia+dirigido
    • https://cdn.shopify.com/s/files/1/0433/9374/5046/files/65703793360.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/arabic_mehndi_design_images_photos_2018.pdf
    • https://cdn.shopify.com/s/files/1/0436/6693/1865/files/63154126991.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/jenuli.pdf
    • https://cdn.shopify.com/s/files/1/0434/5144/9496/files/42854487380.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1512/files/sexebureleferuligomodi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/toomanyitems_mod_for_minecraft_pe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8197/3416/files/41944030331.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6335/files/15368095536.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/tijevopadezijomexadonose.pdf
    • https://cdn.shopify.com/s/files/1/0431/8137/5648/files/bemuda.pdf
    • https://cdn.shopify.com/s/files/1/0432/7024/2460/files/cranberries_dreams_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/cardiologia_saturno.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee5d07c5b341415f93131826afc6ad34.pdf
    • https://static.usrfiles.com/ugd/b8c837_a41e5d5ece614bd98c5f9e7f2b01bf2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_626a7fe04a4f4fcaa4992c9413f713f0.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ae5.bin
e91ce9a6199229bb37d86673f79471c3b8de1a7ac023e077b59426e53c4e0f62
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE5 5388 bytes
font_01_sfnt_off00008d15.bin
16b32708059bfc1ffc58979ce13817f168a1ed9e915dbc2adfc612b66fdd9b5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D15 11924 bytes