Malicious PDF — malware analysis report

Static analysis result for SHA-256 624a034effdcbdb6…

MALICIOUS

PDF

42.4 KB Created: 2020-08-28 12:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e46b104c48c6d02c76073730300dc8a SHA-1: c09f90db2615ec2fffc39ebae6931c0bec55d611 SHA-256: 624a034effdcbdb6e8d6fb6f7c8f7bbbf496f6983e162ff4440d88146903c952
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary URL, https://ttraff.com/pify?keyword=eras+de+la+tierra, is flagged as malicious. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting an attempt to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

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.com/pify?keyword=eras+de+la+tierra
    • http://files.fcorchestras.com/uploads/1/3/1/3/131378776/d08c2.pdf
    • http://povobo.iaclals.com/uploads/1/3/1/0/131069921/b0ae3ae8bcc9da.pdf
    • http://zomeb.waverlyfc.com/uploads/1/3/1/0/131070420/gesepujebebaxu-vigixutenem-nuzizedorexefiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7985/0397/files/40964659465.pdf
    • https://cdn.shopify.com/s/files/1/0430/3237/9545/files/79222444781.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/lijusutudijuvatatim.pdf
    • https://cdn.shopify.com/s/files/1/0433/1841/1417/files/canon_digital_rebel_xs_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6156/files/4611238111.pdf
    • https://cdn.shopify.com/s/files/1/0439/2304/6555/files/xirajidenewaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/jofodupuburunugeruzir.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/56267420971.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_off00006671.bin
bdaf5d9b61e5620be25958604cad739ce9e53fccd943e2f312796877d1b6ba3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6671 4776 bytes
font_01_sfnt_off000076ad.bin
a1cbe20bca7ac0b201f02c43905dc3c899dd0b10976c7802195515d38a1057e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x76AD 11356 bytes