Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a28bee0882c20b6…

MALICIOUS

PDF

53.8 KB Created: 2020-08-12 17:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f77b56be24a3cbc9a9654f959d5dfe8e SHA-1: 6e9502885e46dd9bb62607fe9d53e56d6457612b SHA-256: 5a28bee0882c20b6fb92d3aef7a07d53cee1bf518fd00584f9d99a18965de9e3
152 Risk Score

Malware Insights

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

The PDF contains a high number of links to external resources, many of which are hosted on Shopify and appear to be part of a link farm designed to improve search engine rankings. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to a vehicle owner's manual and the malicious URL, suggesting a lure to drive traffic 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.com/wb?keyword=2006%20jeep%20commander%20owners%20manual%20download%20free
    • http://mavatet.emmalouisetinniswood.co.uk/uploads/1/3/0/8/130814328/5817587.pdf
    • http://files.syrenkastudios.com/uploads/1/3/0/8/130874075/4a4ca01e7bdd70.pdf
    • http://files.brandonoptical.com.au/uploads/1/3/0/7/130776589/bolonumon_dotisawemu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3530/files/42036140282.pdf
    • https://cdn.shopify.com/s/files/1/0445/5052/0996/files/aseptic_food_packaging.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/mejoxobafalotisake.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5966/files/nagalaram.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/probeta_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1160/files/petuferez.pdf
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/givozunofaderapijin.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/33163832194.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/imperative_mood_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/kiran_bank_po_reasoning_book_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/4686/0960/files/nc_e_500.pdf
    • https://cdn.shopify.com/s/files/1/0438/4446/8901/files/25025867528.pdf
    • https://cdn.shopify.com/s/files/1/0433/4249/5899/files/kenmore_elite_refrigerator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/8877/1227/files/pubinum.pdf
    • https://cdn.shopify.com/s/files/1/0431/4637/9426/files/90237784672.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008739.bin
1d638756963406c8690f01d9ab8adffd16dcfd938c5f9b3106d5b534c7165cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8739 5800 bytes
font_01_sfnt_off00009ae3.bin
6021d311b00c75eb336b2def2dacc659084f0c1d23dc0365ed93d2cc92cf1782		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE3 15236 bytes

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