Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5aaf73d0c69de7…

MALICIOUS

PDF

46.6 KB Created: 2020-08-15 18:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11589c62145ae2b2b112e708a69b8555 SHA-1: 79544f0fb8d5e6f49b1506fe90ce1776a582b721 SHA-256: bf5aaf73d0c69de7318610e23b3897ab3601e4feab273342d282c639a2775c28
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious due to a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a PDF link farm, with many external links hosted on cdn.shopify.com, likely for SEO manipulation or to obscure malicious destinations. The document body contains text related to a '2018 chevrolet tahoe premier rst performance edition' and a URL pointing to a ttraff.com redirector, suggesting a lure to entice clicks. No scripts were extracted, limiting the analysis of direct payload execution.

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=2018+chevrolet+tahoe+premier+rst+performance+edition
    • http://files.fullcirclearts.org/uploads/1/3/1/4/131407406/jadukakunegadewesa.pdf
    • http://roxom.themotleyms.com/uploads/1/3/1/8/131857920/f13869e7de97d53.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/adverbs_of_frequency_exercises_1_eso.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/konaviwoxizogalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6315/files/7371661391.pdf
    • https://cdn.shopify.com/s/files/1/0437/5665/0650/files/most_popular_racing_games_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0439/0558/1211/files/23516405380.pdf
    • https://cdn.shopify.com/s/files/1/0436/7984/2457/files/tububexiwomakinugamewir.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6807/files/51230061210.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/gumidu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8509/3272/files/64893283224.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/zetojopojarijijunenid.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8973/files/defobezirepitelepufe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/all_copy_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7078/files/list_of_20_amino_acids_and_structures.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_off00007607.bin
6d016164a9772735646d219870983dab83fdf42224a217369720c7f12953bafa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7607 5880 bytes
font_01_sfnt_off000089e2.bin
e548858554790ba9ff407b554dac364abd7b4a3c1c77e5799aaeb3b467b3bf59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E2 10376 bytes

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