Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5026a8ba850fbb…

MALICIOUS

PDF

51.2 KB Created: 2020-08-14 08:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 357eb403fe04baeaa37d3b1daf46d8ca SHA-1: 6136e5767776420b577ca713d50cf7215e78f8c4 SHA-256: 2f5026a8ba850fbb4deedb6b8972bfc475e2c3642e1ea05c4ccc87884d26fd64
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many pointing to a redirector service. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'lfi waf bypass cheat sheet' and the primary malicious URL is a redirector. The large number of links suggests an attempt to game search engine results or to lure users to malicious sites.

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=lfi+waf+bypass+cheat+sheet
    • http://files.postfallsmusicacademy.com/uploads/1/3/0/7/130776594/kelufizunu.pdf
    • http://files.alutradellc.com/uploads/1/3/1/3/131379971/zajupozodizivu.pdf
    • http://files.braverybox.com/uploads/1/3/0/7/130739742/mesigabiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/56931686336.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/12442043258.pdf
    • https://cdn.shopify.com/s/files/1/0434/7897/4629/files/python_print_function.pdf
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/86528454573.pdf
    • https://cdn.shopify.com/s/files/1/0438/3126/3394/files/34720275234.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6074/files/kuxokogi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2358/7733/files/water_soluble_vitamins_biochemistry.pdf
    • https://cdn.shopify.com/s/files/1/0437/5583/1445/files/coordinating_conjunction_examples_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3471/files/dilinijakukaxenosojixaxod.pdf
    • https://cdn.shopify.com/s/files/1/0434/1186/5751/files/java_recursive_example.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/jafosipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56802730071.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0050/files/dobiwasunije.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006398.bin
721feb7ea6f22445f52e2f399eba7d47d7712cc12d67d41cb65b6c40999016cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6398 4140 bytes
font_01_sfnt_off0000723f.bin
c0efba96fb619b7832ef72fe23f68e3c7e0807054df7edc8cfe09ab7d1c059b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723F 4820 bytes
font_02_sfnt_off000082c7.bin
344d18137824a5c6e47c14a313f5a830e9d5dabaf8c86fc383650f50e5fed927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C7 15212 bytes
font_03_sfnt_off0000b1b0.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B0 4324 bytes

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