Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61dd085a8cd353f…

MALICIOUS

PDF

39.5 KB Created: 2020-08-25 04:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5af71ae2456f89aae7e7b2cd9c5e995 SHA-1: 71a0a5fb965be92bf68fe045e6b87f613d380986 SHA-256: a61dd085a8cd353f1e9e83b14d9b1a3845e33968b73fef41819a93253efa33fa
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm. The primary malicious URL identified is https://ttraff.cc/pify?keyword=basanti+movie++telugu, which is likely used to obscure the final destination of the attack. The document body contains garbled text but also includes the same malicious URL and several other PDF links, reinforcing the link farm and redirection attack pattern. No scripts were extracted from this sample.

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=basanti+movie++telugu
    • http://files.jsh401k.com/uploads/1/3/0/8/130814682/c5854f4836418dc.pdf
    • http://files.nc-so.org/uploads/1/3/1/0/131071249/5398313.pdf
    • http://files.cake-angels.co.uk/uploads/1/3/0/9/130969897/b7d2878f2680e.pdf
    • http://files.grandpopsarmynavy.com/uploads/1/3/1/8/131857315/af71bb099f.pdf
    • http://files.friendsofislandviewbeach.com/uploads/1/3/1/6/131636995/keraz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/auto_repair_times_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2173/7882/files/26505274246.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/sidinixet.pdf
    • https://cdn.shopify.com/s/files/1/0448/3465/2321/files/agonistics_thinking_the_world_politically.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/pepumomonopetuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/funo_das_celulas_caliciformes_no_intestino.pdf
    • https://cdn.shopify.com/s/files/1/0434/4643/6006/files/55768712811.pdf
    • https://cdn.shopify.com/s/files/1/0433/8227/6250/files/mulaxiduzaruduz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1071/1971/files/54916810081.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/comma_splices_and_fused_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0438/6773/4171/files/el_cerebro_humano_y_sus_partes.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_off00005d30.bin
7dba0d5822b1e531be353a7eefcc2afc2f4c671e1ee0bd212baef7b3a2f1ec8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D30 5020 bytes
font_01_sfnt_off00006e33.bin
263bfc2585e0e74da42c84047b25ee12a9c55d000ce960f3d1602831a35b0d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E33 10536 bytes

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