Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ccb3edcbaac5ea…

MALICIOUS

PDF

48.0 KB Created: 2020-08-05 16:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef09ff571400068d3e9f49fd61c4a448 SHA-1: 19159e04512858c10498f535a6e0c81af97b64f5 SHA-256: 85ccb3edcbaac5ea646bec83f7c65e7f517d2759d920b910e188cf6395a9cf30
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. This suggests a phishing or social engineering attack where the user is lured to a malicious site. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the extensive link farm indicates a deliberate attempt to distribute malicious content.

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=entrepreneurship+in+philippine+setting+for+senior+high+school+pdf
    • http://files.walkthruyoga.com/uploads/1/3/1/6/131637037/c44f62.pdf
    • http://files.janeglennie.co.uk/uploads/1/3/1/0/131070476/7d876e795ee3b22.pdf
    • http://files.georgiaraefamilyband.com/uploads/1/3/2/8/132814473/penekamosuvezojufiba.pdf
    • http://files.mainlinepilatesandyoga.com/uploads/1/3/1/3/131380251/a2c8c0a.pdf
    • https://cdn.shopify.com/s/files/1/0430/7232/3737/files/7595558388.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9837/files/3988417965.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/zalupatugodapijasewof.pdf
    • https://cdn.shopify.com/s/files/1/0428/4284/9446/files/bukapixodenagipubasivani.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/pawaganejezuzetubav.pdf
    • https://cdn.shopify.com/s/files/1/0430/0711/5423/files/94547507705.pdf
    • https://cdn.shopify.com/s/files/1/0437/1061/1605/files/33898495331.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7282/files/13695445953.pdf
    • https://cdn.shopify.com/s/files/1/0433/4629/6982/files/nijasimejukololuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/fuwunipagupomak.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/vukuxesi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/technical_analysis_explained_martin_pring_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5216/2462/files/nemasugoferafovuzazanewax.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_off00007d6d.bin
6eb041b6d09f2a01b8f92d82b742a9cc4b7335402b8ed2ee659fc95866a93b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6D 5164 bytes
font_01_sfnt_off00008f02.bin
05c1b7d61075dcbaa433f0f673a65664ebbeedc7732e5075eafcd89a4a119679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F02 10296 bytes

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