Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d3e9b7fc994010…

MALICIOUS

PDF

38.9 KB Created: 2020-08-08 01:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd3756f75722ea9f6097827b7acfde76 SHA-1: e22a3ccb77567e7ef6a199e8e6524f5806a3a17e SHA-256: d7d3e9b7fc994010d24c23ad674dea368036ec3aa4c3683219de9db3f02f6131
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains the text '116 nj transit bus schedule pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of a malicious redirector link strongly indicates this PDF is used for phishing or malware distribution.

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=116+nj+transit+bus+schedule+pdf
    • http://files.justneighborsvt.org/uploads/1/3/2/6/132682640/zudiliw_pipok_rajiporakema_manudalunek.pdf
    • http://files.need2print.net/uploads/1/3/2/6/132682646/1384c6868e1.pdf
    • http://fufexuvi.ds-designs.site/uploads/1/3/1/4/131406717/gunufigogudoweto.pdf
    • https://cdn.shopify.com/s/files/1/0439/8641/9870/files/62433853518.pdf
    • https://cdn.shopify.com/s/files/1/0449/8066/6526/files/www_r_way_com.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8319/files/61737325877.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/purabogisoxoko.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/50938840955.pdf
    • https://cdn.shopify.com/s/files/1/0433/0265/0014/files/57052607431.pdf
    • https://cdn.shopify.com/s/files/1/0435/6525/2771/files/51989098504.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9442/files/zomojutusu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6322/1155/files/agni_siragugal_english_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/39627713366.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0743/files/49355396426.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8890/files/widomani.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005888.bin
9dec20317d7f9913c844f531ce9479e36ea0a2479b0aa067508817defe614942
pdf-font-stream PDF embedded font (sfnt) at offset 0x5888 5572 bytes
font_01_sfnt_off00006b6d.bin
c7fc2295836a6c164ec69c7971bae51e344853fe56348a53f482f7357fc2dfb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6D 10308 bytes