Malicious PDF — malware analysis report

Static analysis result for SHA-256 1982e609b044ac11…

MALICIOUS

PDF

50.9 KB Created: 2020-08-08 02:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb5a3a6516508fbd4ce996dd0db79d96 SHA-1: 1f9e58b975f8f9d12780bdfe6c1583039a56e8d8 SHA-256: 1982e609b044ac11778d79d0d28bc6d92305c57420fc687ef562a15debee37f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources disguised as academic content. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to malicious sites. 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=angle+of+depression+and+elevation+worksheet+pdf
    • http://files.heroscholars.com/uploads/1/3/1/4/131453560/8513089.pdf
    • http://gusotu.fastandforeverfoods.com/uploads/1/3/1/8/131857315/d1225d73772.pdf
    • http://files.everyday-buddhism.com/uploads/1/3/1/4/131412858/vekobikuniviwa-pugadafedenewo-xelij.pdf
    • http://jifit.aishaperez.com/uploads/1/3/2/6/132681352/09c786dd5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/maxuli.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9954/files/52800128318.pdf
    • https://cdn.shopify.com/s/files/1/0433/4927/8875/files/geographical_information_systems_and_science_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/2549/7250/files/clinical_pharmacology_and_therapeutics_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/mixogeriwawixebapadobus.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/tofuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/burket_oral_medicine_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/23287462788.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/pedim.pdf
    • https://cdn.shopify.com/s/files/1/0433/3010/9593/files/sijuxefin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9373/8143/files/6468881687.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/liroleturuwuxizerewag.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/48760297689.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cdd.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDD 2828 bytes
font_01_sfnt_off000086d8.bin
1e93c71aba5f784f4a9b61ece4c962414ec5cbc580fc65dc610a48f4d6bed9a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D8 5508 bytes
font_02_sfnt_off000099af.bin
3724dcae40992bb382e376578e373e9af615393a9a72ca4e27d71a9aadeec34f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99AF 10000 bytes

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