Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdaaaa2adaba6762…

MALICIOUS

PDF

43.8 KB Created: 2020-08-15 02:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c89a01c3fefbbd5137dc7ef24f2ce901 SHA-1: fc17157f8c49eeb6ade89527efad054ab6e191e0 SHA-256: bdaaaa2adaba6762a7ee6a17b69cb387381298286517560fff67394dbf15e0c9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external sites. One critical heuristic identified a link to a known malicious redirector, and the document body itself contains a URL that appears to be a search result lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering through deceptive 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=10th+result+bihar+board+2015+with+marksheet
    • http://somevi.skinnysticksmaplesyrup.com/uploads/1/3/0/7/130739745/zoxogudokijopamija.pdf
    • http://pifenirar.theelementsexchange.com/uploads/1/3/1/4/131437987/ruloxijadajamekup.pdf
    • http://files.metroflowplumbing.com/uploads/1/3/1/4/131438468/5da3529.pdf
    • https://cdn.shopify.com/s/files/1/0450/2922/8702/files/some_any_somebody_anybody_something_anything.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/40644747092.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/17700763740.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6007/files/thoracic_spine_stretches_and_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/articles_on_mergers_and_acquisitions_in_banking_sector.pdf
    • https://cdn.shopify.com/s/files/1/0447/3470/9914/files/logistics_business_proposal.pdf
    • https://cdn.shopify.com/s/files/1/0437/8096/4510/files/srimad_bhagavatam_book_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/14370157446.pdf
    • https://cdn.shopify.com/s/files/1/0437/6595/6759/files/century_battery_charger.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0932/files/lowes_waycross_ga.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9484/files/the_beatles_complete_scores_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/applied_homogeneous_catalysis_with_organometallic_compounds.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_off0000617a.bin
df02f3cf356ed82a1c68c2efafea0eac4dc95869ecff5a83a587e66e19619afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617A 5716 bytes
font_01_sfnt_off000074d4.bin
7420db9ec41012b263dff8e0d039d2a895961a6b4c1647eabbcd20f441fad98a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D4 1936 bytes
font_02_sfnt_off00007e1b.bin
6829c37ee93ce1bb220a6229eef53717fa00034493dc949c73b9eac1bd4309e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1B 10352 bytes

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