Malicious PDF — malware analysis report

Static analysis result for SHA-256 be715c94f4b0e76c…

MALICIOUS

PDF

48.6 KB Created: 2020-08-07 02:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3612965b34d62e3b984e1a8444330f6 SHA-1: 545b34b5189e5edccdef2ec9352e198a4dc9cf5f SHA-256: be715c94f4b0e76c1ad5d0bc049e9858d6b46012e6a59797a8198375b59e8252
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a phishing or malware download page. The document body, though heavily obfuscated, contains URLs that are part of this link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/pify?keyword=acidity+and+basicity+pdf
    • http://files.nhsofdav.com/uploads/1/3/1/8/131857527/8041702.pdf
    • http://files.theweddingcentrenuneaton.co.uk/uploads/1/3/0/8/130874090/34d00c8adb.pdf
    • http://files.churchbestpractices.org/uploads/1/3/1/3/131380666/xofisikawaxav.pdf
    • http://files.amyowendoulaservices.com/uploads/1/3/1/1/131164048/jamomigekuzup_fobad.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6970/files/27415101493.pdf
    • https://cdn.shopify.com/s/files/1/0431/6607/2994/files/bezigobaxerosonapas.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5290/files/15451734895.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/talalobomifuzelonog.pdf
    • https://cdn.shopify.com/s/files/1/0436/1424/0931/files/joel_osteen_become_a_better_you_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5134/3269/files/jaluninamala.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3534/files/62603779109.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/wolijobiwufuzup.pdf
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/jiwumufiwedenud.pdf
    • https://cdn.shopify.com/s/files/1/0432/4261/9035/files/86640242133.pdf
    • https://cdn.shopify.com/s/files/1/0433/9843/0876/files/english_grammar_placement_test_with_answers.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_off00007e88.bin
644e1bfdbb9c04b413792d27c85f71500ea940db3c63802768ddc30108f19193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E88 5252 bytes
font_01_sfnt_off00009083.bin
1cc7e8fdc6a8e4251b9b6c1a41428140d041f5d354c6c8b4e34502fee4baccec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9083 10716 bytes

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