Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5666b11f75614ce…

MALICIOUS

PDF

50.1 KB Created: 2020-08-20 20:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10d0358d58265aed06da73dfceef1b6f SHA-1: 78b4f4d07076f204e2dda6c3df34b809371ecd09 SHA-256: c5666b11f75614cead5a60bc525bab9051d53312237196bb56ae273474f4567b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, forming a link farm, with one critical link redirecting to a known malicious URL. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample, but the extensive use of malicious and link farm URLs indicates a phishing or redirection attempt.

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.ru/pify?keyword=android+10+release+verizon
    • http://files.eastcoastcakeco.com.au/uploads/1/3/1/4/131437378/3a35521a0c4.pdf
    • http://files.westmeadhospitalwhistleblowers.com/uploads/1/3/1/8/131856195/rimoratabijomova.pdf
    • http://redom.ipksportsbetting.com/uploads/1/3/1/8/131857252/xulubafude_fowiwu_sowelorujigeb_kamagigo.pdf
    • http://betukal.ofcstrategy.com/uploads/1/3/2/6/132680869/ad1cb398864.pdf
    • http://files.iguanamercenary.com/uploads/1/3/1/0/131070452/500861.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0273/files/bahria_town_karachi_full_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0268/files/34928381045.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/biwamewumelejogaxuwobiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/nemiparuwuginotapu.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/subnautica_base_building_tips.pdf
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/aptitude_test_for_pilot_training.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5235/files/59260103847.pdf
    • https://cdn.shopify.com/s/files/1/0434/4286/4294/files/10015280021.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5265/files/wixixexanudalo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2247/4651/files/android_x86_dual_boot_easybcd.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/buduje.pdf
    • https://cdn.shopify.com/s/files/1/0436/0660/5981/files/bose_soundbar_700_remote_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/2330742192.pdf
    • https://cdn.shopify.com/s/files/1/0428/4507/7671/files/age_definition_sociology.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/1/0428

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008639.bin
cec35bf5b936429c0b6a66afd19e57ed8aa467eb43d6897489c70a64d07238cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8639 5112 bytes
font_01_sfnt_off000097b5.bin
898aa3b3282b17da0606812dd7789fec793b27021b6f89dbd7cc33ed9d577b5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B5 10528 bytes

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