Malicious PDF — malware analysis report

Static analysis result for SHA-256 177ce738364ff018…

MALICIOUS

PDF

44.6 KB Created: 2020-08-03 07:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8b0babe92a8f7228729f8bd78533c78 SHA-1: 2e478193fe7fb9d402e9c7c17f05e0e8deddd0db SHA-256: 177ce738364ff0181f857bc8fef4aa7c41a67fcec0ac322588f152c8b176ce08
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a malicious redirector infrastructure. The document body text, though garbled, mentions 'Acethinker video downloader', suggesting a lure to trick users into clicking the malicious links. The ML classifier strongly indicated maliciousness, and the presence of numerous external links is a known tactic for SEO spam and potentially malicious redirection.

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=acethinker+video+downloader
    • http://files.v23next.com/uploads/1/3/1/3/131381675/2800260.pdf
    • http://files.skickrocks.com/uploads/1/3/0/9/130969847/latumota-kuwefakeb-dofinowu.pdf
    • http://files.keenefarmersmarket.com/uploads/1/3/1/4/131407547/3411243.pdf
    • http://files.baypowerengineeringltd.com/uploads/1/3/1/0/131070688/jesuge.pdf
    • http://files.sammungai.com/uploads/1/3/0/7/130774990/3ae346a51335d10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/6588/4323/files/jugijoropasixetus.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/argent_crusade_tabard.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/41901626466.pdf
    • https://cdn.shopify.com/s/files/1/0431/9746/4731/files/17494000707.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4016/files/fovavoragerojabefori.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/zowesidut.pdf
    • https://cdn.shopify.com/s/files/1/0438/2870/7485/files/cs_go_config.pdf
    • https://cdn.shopify.com/s/files/1/0427/9799/0055/files/dobobizizino.pdf
    • https://cdn.shopify.com/s/files/1/0429/6074/8695/files/godovanamipererax.pdf
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/fafaxefadixomubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/sofurelapaluvelexe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8211/3433/files/gemelijimanasitob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063c5.bin
c287d82e690081f5cb8e3aed8b9465070f16729a587bdb02457ff1be0aacf375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C5 4840 bytes
font_01_sfnt_off0000742b.bin
b342ff2e7193866f6a7f876422c5879c9a74193035d333e6aee8c6e797344c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742B 10352 bytes
font_02_sfnt_off00009794.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9794 4324 bytes

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