Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f79c2fd197fd0b0…

MALICIOUS

PDF

53.7 KB Created: 2020-08-05 02:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e3796ce10c67ae752fedea5e6024288 SHA-1: 38a3cb7d74a209f7d517cb67425f542d207af2e9 SHA-256: 8f79c2fd197fd0b0724ee331009c45b78b51d36a6febe930db9ae6b5ea2912a2
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to funnel users to further malicious content. The document body, though heavily obfuscated, contains the same URL and keywords suggesting a lure for users interested in business documents. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious content.

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.com/pify?keyword=business+english+human+resources+pdf
    • http://files.mauisreef.com/uploads/1/3/2/7/132740637/lijukibakubeve_wusevewol_xusevojekew.pdf
    • http://files.13thdistrictofohio.org/uploads/1/3/2/6/132682040/pugikutopufamidameba.pdf
    • http://files.mydtech.net/uploads/1/3/1/6/131637477/bajepalil-reribaxuso-selipiba.pdf
    • http://bepifeb.palsjamaica.org/uploads/1/3/0/8/130813821/logekoliw.pdf
    • http://files.adrigizmo.com/uploads/1/3/0/9/130969754/5ef7c514e.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/39784444122.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3639/files/traducir_archivo_en_ingles_a_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/wipogudorenuvakifisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/mewevitufidukiliv.pdf
    • https://cdn.shopify.com/s/files/1/0438/2264/5408/files/anatomy_of_ruminant_digestive_system.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/runuvokozemi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/bisaja.pdf
    • https://cdn.shopify.com/s/files/1/0434/3113/3340/files/74838094212.pdf
    • https://cdn.shopify.com/s/files/1/0430/2998/7489/files/nusifitezoxofibaloxib.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/88616391256.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/rironanenapufubad.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/levitolalawasan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086a2.bin
6033aa408c815e2fb7aa86239a2daaeccfc231643f2b22a9a6d3c4e1cdd93f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A2 5420 bytes
font_01_sfnt_off000098ce.bin
f1cf5919b737e88b72cffa79fd5d850a5909fb9c1eff76a1b3e2451aaf616e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98CE 10164 bytes
font_02_sfnt_off0000bb84.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB84 4324 bytes

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