Malicious PDF — malware analysis report

Static analysis result for SHA-256 b457d8505e1ffdfb…

MALICIOUS

PDF

44.6 KB Created: 2020-08-26 09:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbda6bdbc8a9ff37770521cf8d27983d SHA-1: 9a2302b7cb142cd37a635788a473bc76574d4ce4 SHA-256: b457d8505e1ffdfb2722f24c2cbdcf1faf25f4a426be1b56f2ddc144b59b5651
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with one pointing to a known malicious redirector. The document body itself is heavily obfuscated and appears to be auto-generated content, likely to serve as a lure for SEO manipulation or to host a link farm. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via the embedded links.

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=pharmacology+of+anticancer+drugs+ppt
    • http://files.lesliemcgeaghhypnosis.com/uploads/1/3/2/6/132695445/6947614.pdf
    • http://files.dangerday.com/uploads/1/3/1/3/131383247/tavefobefuridad-kenavaxo.pdf
    • http://kojexem.chasingbears.com.au/uploads/1/3/2/7/132740480/sidezixok.pdf
    • http://raxalabo.thelabdesigngroup.com/uploads/1/3/0/7/130775027/xezuwabefadofe.pdf
    • http://tutabedot.stage2screen.com.au/uploads/1/3/0/9/130969465/devina_liram_rakuwepoda_jibeginifujemo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/runumatiginofokapekaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4696/files/digital_storage_oscilloscope_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3301/files/chabot_lake_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/81184654143.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/bifasugoku.pdf
    • https://cdn.shopify.com/s/files/1/0432/2351/5294/files/equations_of_straight_lines_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/carnatic_music_notes_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3902/files/boyer_biochemistry_laboratory.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9504/files/gaxojok.pdf
    • https://cdn.shopify.com/s/files/1/0447/1059/2668/files/apocalyptic_literature.pdf
    • https://cdn.shopify.com/s/files/1/0431/4290/6007/files/metabolismo_de_lipidos_en_rumiantes.pdf
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/6436626714.pdf
    • https://cdn.shopify.com/s/files/1/0433/7611/5863/files/rekewarozateduwuzadamo.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_off00007055.bin
f9e1a51d0e2874a44412de04a3e75984b61902ff13cd9c5734e7439ad40e3ea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7055 5672 bytes
font_01_sfnt_off0000837b.bin
58168fe4596742a5dc1c39c9701db420325e4b92aaed57dafffa817b24cba354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x837B 9972 bytes

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