Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c4796e290b2c02…

MALICIOUS

PDF

45.3 KB Created: 2020-09-02 06:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3ce2c57a90d7149ac60d150eb9666cb SHA-1: dd2e1bed7cd800872163bf88e8d47bffbbca9870 SHA-256: 14c4796e290b2c0246987c3bb235adbe28988f42efb88791723bc1a13f04770b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, includes the same malicious URL and a benign-looking PDF filename, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=business+analyst+reporting+line
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/kogilisipigezifofuzirif.pdf
    • https://cdn.shopify.com/s/files/1/0450/0835/5486/files/hack_wifi_android_wpa2_psk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/15250232290.pdf
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/29562459582.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0067/files/jivimapejerividatogakipot.pdf
    • https://cdn.shopify.com/s/files/1/0436/1755/0499/files/polyploidy_and_aneuploidy.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/tobedewimoxazomexegaxire.pdf
    • https://static.usrfiles.com/ugd/0dd040_cdfd1b53ba5443ccb12377412629e829.pdf
    • https://static.usrfiles.com/ugd/b8c837_f451dc816fca4411af055875a0af53e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_09d7ed6d04fc4aa49b9d499d3843d6c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9acc0b0a0f4400c95413b4d3c671cf6.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_731b52942d8d46399204b386d16c3285.pdf
    • https://static.usrfiles.com/ugd/c63bf9_e6647d7bad2f4b6ea6db79ce9a4d228b.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_off000065b7.bin
d5eed3b85bbeced716547eec9a22d1274674e77a9fb265c97766ae6a301675c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x65B7 5136 bytes
font_01_sfnt_off0000774e.bin
21b8f11cf9af901c8c82a6520212450400af8b436da52089c9851a13615cab90
pdf-font-stream PDF embedded font (sfnt) at offset 0x774E 15152 bytes