Malicious PDF — malware analysis report

Static analysis result for SHA-256 6876374821dc84cb…

MALICIOUS

PDF

52.6 KB Created: 2020-08-30 20:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aeec1e8022cfde66b47cc495d1afe8c9 SHA-1: 0581bd22c09aea6497e14785d37b669e83d7dac9 SHA-256: 6876374821dc84cbafd3871d98cd30bda064c80420b183b6fe0058b7a7d993c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.club, which is designed to lead users to further malicious content. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm or spamming operation. The ML classifier also strongly indicates maliciousness. The embedded URL `https://ttraff.club/wix?keyword=calcul+de+la+fleche` is the primary indicator of malicious intent.

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.club/wix?keyword=calcul+de+la+fleche
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6a4a28552da14ee794c5e4c0b8485d81.pdf
    • https://static.usrfiles.com/ugd/f84671_d0e9273ead394988918f899eb37972ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_e861cdc6299c4cf8adb30d40da9b057c.pdf
    • https://static.usrfiles.com/ugd/b8c837_38ccea0c44e842ccbf725d4463304f12.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7255/files/tutuma.pdf
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/aefe_espace_public_formation_continue.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4124/files/dinefetugefika.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/65510529784.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/wolebepasixekavakagumugij.pdf
    • https://cdn.shopify.com/s/files/1/0454/9004/5080/files/vuviwiweriwosute.pdf
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/javascript_convert_base64_to_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/3224/8469/files/defensins_antimicrobial_peptides_of_innate_immunity.pdf
    • https://cdn.shopify.com/s/files/1/0434/2874/1272/files/85878105706.pdf
    • https://cdn.shopify.com/s/files/1/0461/4579/8307/files/56120984367.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6917/files/calcium_alginate_beads.pdf
    • https://cdn.shopify.com/s/files/1/0461/7437/1993/files/dealing_with_rejection_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/3255/9263/files/praise_you_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/6611/2662/files/58078583937.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c51.bin
dadca72db25f264d85f85784eabb9d335e9be655ea3bfe3614fb37705bb6d47c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C51 4740 bytes
font_01_sfnt_off00009c5f.bin
288bf085f5d86d0f8129fba31f6873f9d3a4c03fee4b65f17949d0ab1cedf86d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5F 12756 bytes

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