PDF malware analysis — malicious · 3bba6f779c7a8596

MALICIOUS

PDF

41.1 KB Created: 2020-08-27 22:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2f7147c348c36ebe9b9fb8517b5c01c2 SHA-1: 4874526071114685e12f557d3b5ff3b938fdbd77 SHA-256: 3bba6f779c7a85961a3a6415071b1c6233eb5ed64cf3d2b4f7cdac1c2b08048c

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body is heavily obfuscated but contains text suggesting it is a lure for 'chemistry the central science 14th edition pdf', likely to trick users into clicking the malicious links. 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.ru/pify?keyword=chemistry+the+central+science+14th+edition+pdf
- http://guzexuja.outtathebarn.com/uploads/1/3/1/6/131606490/nixumudupozunuwep.pdf
- http://files.lesniaklab.com/uploads/1/3/2/6/132695870/2484920.pdf
- http://files.guthealthconsultancy.com/uploads/1/3/1/3/131379183/8b75d33c316.pdf
- http://files.eggimannfarms.com/uploads/1/3/0/7/130775306/9299a48a2.pdf
- https://cdn.shopify.com/s/files/1/0432/3170/7294/files/bricks_and_balls_mod_apk_revdl.pdf
- https://cdn.shopify.com/s/files/1/0429/6926/8383/files/bidisokozumojiwate.pdf
- https://cdn.shopify.com/s/files/1/0436/1447/0302/files/tulja_bhavani_stotra.pdf
- https://cdn.shopify.com/s/files/1/0437/3122/2682/files/funopijufererike.pdf
- https://cdn.shopify.com/s/files/1/0430/2451/5229/files/11824389981.pdf
- https://cdn.shopify.com/s/files/1/0430/7789/4297/files/chemical_engineering_interview_questions_and_answers_for_freshers.pdf
- https://cdn.shopify.com/s/files/1/0436/0850/6531/files/andr_luiz_santa_cruz_ramos_direito_empresarial_esquematizado.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.

Filename	Kind	Source	Size
`font_00_sfnt_off000062ae.bin` `98391a7d4eef33874d3625d46854940583793e9433e5f3e701efa815f0da9a44`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62AE	5544 bytes
`font_01_sfnt_off00007566.bin` `6312408d459d3193f8f7c154d451812eae3d8f38b3697f27a7a91399b4ec33ee`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7566	9956 bytes

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