Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7928182190532b…

MALICIOUS

PDF

51.5 KB Created: 2020-08-11 00:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e03e9e414f98bf4dd4165b56d941d485 SHA-1: df647b63556ccdd126493d2e3266b40eff011b04 SHA-256: eb7928182190532bb70f3522c36f9ed93c4dc617cc7bd8faed5925c13aba12ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a physics lab report, aiming to lure users to a harmful website. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The primary malicious IOC is the redirector URL.

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=informe+de+laboratorio+de+fisica+caida+libre+pdf
    • http://files.lifestylerant.com/uploads/1/3/1/4/131437131/ebcb9f13.pdf
    • http://files.museumtrustee.org/uploads/1/3/1/4/131453588/puxowuviratidu.pdf
    • http://files.conciergesleepmedicine.com/uploads/1/3/1/6/131637763/844964d1b9da.pdf
    • http://files.katefulcherconservation.com/uploads/1/3/1/0/131070539/zavonixolunewev.pdf
    • https://cdn.shopify.com/s/files/1/0435/9041/8591/files/48560527169.pdf
    • https://cdn.shopify.com/s/files/1/0427/8334/2748/files/86639778388.pdf
    • https://cdn.shopify.com/s/files/1/0431/8219/4852/files/21743023785.pdf
    • https://cdn.shopify.com/s/files/1/0437/7218/2685/files/53832114767.pdf
    • https://cdn.shopify.com/s/files/1/0430/8143/3242/files/7323653363.pdf
    • https://cdn.shopify.com/s/files/1/0431/5991/2610/files/18202682136.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8102/files/manual_de_biomagnetismo_medico_cleotilde_pineda_cabrera.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pedarivorenali.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/cooking_guide_vanilla_wow.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/murobupijabubawonarugotex.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2677/files/28666913877.pdf
    • https://cdn.shopify.com/s/files/1/0429/2214/8003/files/zomoxakezez.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/kawogefedabej.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5645/files/bamedukezivuwusugumejoxet.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_off000074fa.bin
0727529401fe802ed9d02ac4b3bed84f53da9d0a5838f1dab7fe2f7579417e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FA 1696 bytes
font_01_sfnt_off00007d24.bin
e46fb04a1a89cca5e6182503a5ecbe2a13a497a509a0db0aaf7623bca093947b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D24 5380 bytes
font_02_sfnt_off00008f47.bin
e7863eabe8927bca95a9db169813c6f77cf993b3da5c6122578133a4e5259ea3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F47 15772 bytes

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