Malicious PDF — malware analysis report

Static analysis result for SHA-256 8614e83878cea4d4…

MALICIOUS

PDF

43.6 KB Created: 2020-08-12 20:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56bf5618953d387743628631a8f5a686 SHA-1: 8ba48c6ac03cbe975ae68802c7fd8f8b567032d6 SHA-256: 8614e83878cea4d4873c8e5d9c717948345bceb20ec9edd110bc66446145a0cf
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or distribution mechanism. The primary malicious URL identified is https://ttraff.cc/pify?keyword=arne+naess+libros+pdf. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious content or facilitate further compromise.

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=arne+naess+libros+pdf
    • http://fakulage.drtonybushati.com/uploads/1/3/1/4/131437044/d642935.pdf
    • http://fokaroxom.melissayvonnephotography.com/uploads/1/3/1/4/131452883/baluzurejelo.pdf
    • http://files.ourpatchprojects.com/uploads/1/3/1/3/131398360/598236.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1239/9009/files/3846714873.pdf
    • https://cdn.shopify.com/s/files/1/0430/0547/7023/files/reduce_file_size_online_without_losing_quality.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/13946317832.pdf
    • https://cdn.shopify.com/s/files/1/0433/5891/2662/files/bogivowiwijawerebe.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8850/files/monememexaba.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/55913706305.pdf
    • https://cdn.shopify.com/s/files/1/0432/0624/6557/files/26340845421.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31082235151.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/rezatekapewonatitudukugi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/6304/1430/files/tanaliwabexuzabasi.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_off00006c03.bin
53d32a06bb28154c752f0eebc19eab17d4a481f1bb9237c0021df96033505f67
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C03 5164 bytes
font_01_sfnt_off00007d8c.bin
71ece7a7199957868c9241b704891d01b820e2c07454185d95b2f79c60b71241
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D8C 10876 bytes