Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc90197e8880ca15…

MALICIOUS

PDF

54.1 KB Created: 2020-09-16 21:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32b2271342917a402043f3e7bd69db5a SHA-1: 1d5e6599b157358bd07fd2c7f3a82ef27d1b30c0 SHA-256: cc90197e8880ca153026a7d6c51656965c106469816e074b93e05d29af2508e5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and appear to be part of a link farm designed for SEO manipulation. One prominent link directs to a known malicious redirector. The document body, though heavily obfuscated, contains keywords related to refrigerator parts and the tool used to generate the PDF, suggesting a lure to attract users searching for specific terms. The ML classifier strongly indicated maliciousness.

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.me/wix?keyword=ge+double+door+refrigerator+parts
    • http://files.tammrabroughton.com/uploads/1/3/1/8/131856456/banamidatu_fumorowapikuz_dibebotimazas.pdf
    • http://beton.awrc.org.au/uploads/1/3/1/4/131438175/satuwozez.pdf
    • http://xijitivuk.commongroundforafrica.org/uploads/1/3/0/8/130814526/eb7feaf.pdf
    • http://jamaj.theopenbus.com/uploads/1/3/2/6/132683138/vamusedejagi.pdf
    • http://tirerib.fordjudoclub.org/uploads/1/3/2/8/132815196/497375.pdf
    • http://nojexavo.monitheseries.com/uploads/1/3/1/8/131856158/318ca7.pdf
    • http://nutotigum.kristinfurbeck.com/uploads/1/3/0/7/130739476/fituwedonulo-nesoxiwefoxuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2332/files/animal_classification_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/0493/5835/files/77958235067.pdf
    • https://cdn.shopify.com/s/files/1/0437/4547/6757/files/blouse_cutting_in_marathi_video.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9390/files/lupelemeroparanuwala.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/lapebopunonerirosu.pdf
    • https://cdn.shopify.com/s/files/1/0480/9998/3524/files/gewefivilemajuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/66226363807.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008897.bin
2db9b38dd3fb3ccfc735b49f458bbdd2dd73a9957a2bc2fcc62ac115227c094f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8897 5156 bytes
font_01_sfnt_off00009a2f.bin
e72c99bf53583c887c30f06157a84bfb41a640c777add98ad0d575f87b435796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2F 10300 bytes
font_02_sfnt_off0000bd7e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7E 4324 bytes

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