Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0901b779e0a596…

MALICIOUS

PDF

56.4 KB Created: 2020-08-03 14:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d69605861bb09564bc4e29b362487fe4 SHA-1: e6a06795266554bc9206f999240197d4ca390dc7 SHA-256: aa0901b779e0a596d65ab01e8f527131c6f06d8903cbaece86677479618bd0bb
128 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body text, though partially obfuscated, contains a lure related to "Cet davv previous year papers pdf" and a call-to-action phrase, suggesting a phishing or scam attempt. The file also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on Shopify. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=cet+davv+previous+year+papers+pdf
    • http://files.potomacschoolrobotics.org/uploads/1/3/1/8/131856160/9476628.pdf
    • http://dizemaguw.alumadembo.com/uploads/1/3/2/6/132681443/fonom.pdf
    • http://files.howesenglish.com/uploads/1/3/0/9/130969446/faneporugukuji_sadujopenosaner_loxigulufak.pdf
    • http://files.pawsla.org/uploads/1/3/1/0/131070483/vetoze_raneniwitisev_kawotilavo_laritovegonis.pdf
    • http://files.mrmichaelmccloskey.com/uploads/1/3/1/4/131453871/2858698.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/72387319946.pdf
    • https://cdn.shopify.com/s/files/1/0438/4784/4000/files/mapuxopabatotufe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/dining_philosophers_problem_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/2887/2359/files/18713145175.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/13647701610.pdf
    • https://cdn.shopify.com/s/files/1/0436/8944/3483/files/lokelulavavasuwapi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1692/8923/files/78605398961.pdf
    • https://cdn.shopify.com/s/files/1/0440/4668/0214/files/java_tic_tac_toe.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/vomuvu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/95720662383.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/63272551720.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0454/files/devops_tutorial.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000c24f.bin
bb07c81027b15ac3730cc7d0ea199e91cfd2d35540baaf0e31f68863fbe783c7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC24F 4624 bytes
font_00_sfnt_off00006c4a.bin
1d835e8e32e9e557ac552c5ec111c72d5ad5bfb2bb3be66287ae850cb0f6a1b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4A 5068 bytes
font_01_sfnt_off00007d9b.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9B 2320 bytes
font_02_sfnt_off000087eb.bin
116d408a26a061f20a2c6043d81ee70a0c91a50364ade214943d8fffbb20e6b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87EB 10916 bytes
font_03_sfnt_off0000ac72.bin
2e6f62d03ca694d51db6438869c7089cd13619132763b45bf38b4d493cb58c16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC72 16284 bytes

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