Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f0b87768f74d15…

MALICIOUS

PDF

40.3 KB Created: 2020-08-20 12:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16b489e8bcfcdae1a68376f2c09ceb87 SHA-1: 6c4b1aae1f9b7696d93a9829fd896f278346fe9c SHA-256: 84f0b87768f74d151f8c8d06079b99cd844370c0469fce57311b7c7d3d2e8d3c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used to obscure the final destination. The document body, though heavily corrupted, contains the text 'Free online template for resume' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=free+online+template+for+resume
    • http://files.dougsbmr.net/uploads/1/3/0/7/130739383/8514821.pdf
    • http://files.dicastables.com/uploads/1/3/2/7/132712235/videnexaw-rivanokuvobed-bubokusibinuwo-xinefojulaxedo.pdf
    • http://files.carolynleighthomas.com/uploads/1/3/1/3/131379860/wapase_sujazidifuse_guzuwo_kimazozeziva.pdf
    • http://pewexe.earthtocolor.com/uploads/1/3/2/6/132680866/nosefebixewed_zavilam_rozikeri_liranexow.pdf
    • http://kikub.karenlabeau.com/uploads/1/3/1/0/131070197/risajigotati_monowizi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/bipomaniwojuwadukimim.pdf
    • https://cdn.shopify.com/s/files/1/0462/7349/5200/files/interpreting_ecological_data_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/0634/5895/files/zoology_mcqs_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/texubibozexapokipo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/rovalemekowadapevoxiruvaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6023/files/authorized_king_james_bible_1611.pdf
    • https://cdn.shopify.com/s/files/1/0437/4754/1146/files/field_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/85111974454.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5706/files/55856042816.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_off00006483.bin
768e52676a047eb480ca64f1d679b8d884f40cdea3a594b1fc6abb805a16a189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6483 5000 bytes
font_01_sfnt_off0000756c.bin
e60e9d568df6f690720d7358122a19577e37355ed853aa1c9b2998edabb99470		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756C 9116 bytes

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