Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d2bf15af01db2e…

MALICIOUS

PDF

41.7 KB Created: 2020-08-06 07:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c9daed65addf6da7e1fba3944e693ef SHA-1: 7ff042ae59191bd9b399a981c7c9743f70db56f6 SHA-256: a8d2bf15af01db2e75073fe28b3a383596bde42e0977cca9beefad2f998f3050
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a high number of embedded links, including one pointing to a known malicious redirector. The document body and embedded link structures suggest a link farm or SEO manipulation tactic, likely intended to drive traffic to malicious sites or distribute further malware. No scripts were extracted, but the extensive use of external links is the primary indicator of malicious intent.

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=advantages+and+disadvantages+of+integrated+accounting+system+pdf
    • http://files.adelaidechickensittingservice.com/uploads/1/3/1/8/131857071/wovakemeluwo-bokevanukapaku.pdf
    • http://files.tuscanoaks.org/uploads/1/3/1/3/131398541/sufiwate.pdf
    • http://files.redbugreach.com/uploads/1/3/1/1/131164176/maxowupejufulijipug.pdf
    • http://files.rudolphsculpture.com/uploads/1/3/0/8/130874490/rokeruzuzepire.pdf
    • http://files.acomputerconsultant.com/uploads/1/3/2/6/132681164/finuzipavudi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/90678898647.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/tiburivozez.pdf
    • https://cdn.shopify.com/s/files/1/0431/2511/2994/files/list_tmux_sessions.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/gunuximebexezorike.pdf
    • https://cdn.shopify.com/s/files/1/0440/8446/1720/files/biwidejudufajug.pdf
    • https://cdn.shopify.com/s/files/1/0439/1596/8667/files/wasteland_2_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7815/files/craftsman_109._20630_lathe_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/varuxokawuginulave.pdf
    • https://cdn.shopify.com/s/files/1/0440/6666/8694/files/nenimusajumal.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7637/files/kubler_ross_stages_of_grief_and_loss.pdf
    • https://cdn.shopify.com/s/files/1/0428/0755/8310/files/nuvawilule.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_off0000647f.bin
76a1d7951dfa994477dbbe58130ab8e0867f40ca4c89c80735d6448282979638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647F 5592 bytes
font_01_sfnt_off0000778b.bin
b95a5c8cb1a45a36bb71ebeedd0543bb9b7540c9a55205b72d2878c20f7b242d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778B 9916 bytes

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