Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfac17fefdf26358…

MALICIOUS

PDF

51.9 KB Created: 2020-08-02 06:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef0476159b24aa27a1f8f3ae104be7b6 SHA-1: 31fce6e5fa9d4318b1608f7cabb21cdb5579c67b SHA-256: bfac17fefdf26358c3fb4fac162bfe40b9a527ba6b2b31ccf747741f245f75ad
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a large number of external links, including a known malicious redirector. The document body contains the string 'f string python' and a URL pointing to a redirector, suggesting a lure to external malicious content. The presence of numerous links hosted on cdn.shopify.com, alongside the malicious redirector, indicates a link farm strategy.

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.cc/pify?keyword=f+string+python
    • http://files.hannahsworldtravels.com/uploads/1/3/1/8/131856170/tepitojaruxe_pizegemuxiwal_vupipuwenulix.pdf
    • http://files.agawegier.com/uploads/1/3/2/7/132740423/6327389.pdf
    • http://files.takakohasegawa.net/uploads/1/3/0/7/130776043/podabone.pdf
    • http://files.jimjonesdesigns.com/uploads/1/3/1/8/131856907/wafavojoponido-notutax-jarumese-zojif.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/paxuluvanarap.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/90325811480.pdf
    • https://cdn.shopify.com/s/files/1/0429/4069/4684/files/free_mahjong_link.pdf
    • https://cdn.shopify.com/s/files/1/0431/4854/2109/files/22952392616.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/sagefewupopat.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/82120738337.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/buvanirazafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xopafomapezujiwowab.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/65387093827.pdf
    • https://cdn.shopify.com/s/files/1/0429/7873/8335/files/poxosizuwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8665/files/zokasikaluzunatuti.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/pibagenon.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/45540763029.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
stream_005_off000098fc.bin
c6fcdab1bf4176ade99ab85984585a780098256ca43a77d4c781dd402e768896		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x98FC 17976 bytes
font_00_sfnt_off0000652d.bin
71a2f4ce31f05b9ffd05d15f2d17706a173bed536377acbaca9936b2723e9d99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x652D 4564 bytes
font_01_sfnt_off000074a2.bin
3a14e73a6689aff189d670d4489fc07857b269b946793f675f26019ffde609a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A2 10580 bytes
font_03_sfnt_off0000b457.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB457 4324 bytes

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