Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f505966fdd2ff34…

MALICIOUS

PDF

43.5 KB Created: 2020-08-11 16:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4172f8e8032f14f1c5ac8b30a5699c SHA-1: 2e230d639e30a0fee77dc4be3b323626cb3a39d5 SHA-256: 5f505966fdd2ff34413656317414ea96ff39bfe9e3d944cf8101c11d164df9bc
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body, though partially corrupted, includes text suggesting it is a PDF related to 'boats and streams questions with answers', likely a lure. The presence of many external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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=boats+and+streams+questions+with+answers+pdf
    • http://files.naturaholistics.com.au/uploads/1/3/0/8/130814902/bdf1a24.pdf
    • http://xinirexif.fryeins.com/uploads/1/3/1/3/131380429/1057526.pdf
    • http://gefuta.orderfreshmed.com/uploads/1/3/0/8/130874493/ea2c3dc1dd41.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4099/5490/files/jepibipigipomanaru.pdf
    • https://cdn.shopify.com/s/files/1/0436/1977/8720/files/bharti_airtel_annual_report_2020_09.pdf
    • https://cdn.shopify.com/s/files/1/0431/3396/0341/files/41629971792.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5984/files/47226297394.pdf
    • https://cdn.shopify.com/s/files/1/0448/4520/3618/files/express_js_tutorial_point.pdf
    • https://cdn.shopify.com/s/files/1/0431/7184/0161/files/avenged_sevenfold_buried_alive_tab.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/33328512642.pdf
    • https://cdn.shopify.com/s/files/1/0435/6915/2159/files/38795094757.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/79186210800.pdf
    • https://cdn.shopify.com/s/files/1/0432/3160/8989/files/79485413300.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_off00005fd5.bin
db97524054abb576e9ac691422b58a10ca50e006d13651becea295b03bcce8ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD5 5516 bytes
font_01_sfnt_off00007273.bin
94b474dff9d4115e54fdea14cbc88459a244df8a36e008f0b44726af52f4426f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7273 14788 bytes