Malicious PDF — malware analysis report

Static analysis result for SHA-256 f649a4241b9a73fa…

MALICIOUS

PDF

48.4 KB Created: 2020-08-20 20:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19f89cc4dd0521c517579a6ed8a2d57e SHA-1: d1dcbde077c01df3b1b23ec282659ae10266495e SHA-256: f649a4241b9a73fa678319dc4ffa585ca2d1a048e7cf0ceb6ff014246a652d96
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary URL redirecting to a malicious site. The document body, though malformed, contains text related to the initial search query, suggesting a lure to encourage clicks. The ML classifier strongly indicated maliciousness, and the PDF structure points to a link-farming technique 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.ru/pify?keyword=ultrasound+guided+cortisone+injection+shoulder+cost
    • http://files.jeffandpamterrell.com/uploads/1/3/2/6/132695242/wokamebazusasix_dilif.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/duniro.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/sisabileladewepeg.pdf
    • https://cdn.shopify.com/s/files/1/0444/2315/1783/files/javatal.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/calidad_de_vida_segun_la_oms.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/rune_workshop_tool.pdf
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/1133193076.pdf
    • https://cdn.shopify.com/s/files/1/0433/3774/4534/files/kinetic_theory_properties_of_fluids_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/9604/6752/files/ahsanul_bayan_bangla_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/74909552138.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000717c.bin
9888899ee5cb8307108fe9bb1960e93640e48fabda0e568c262ee7178acb8d7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x717C 5152 bytes
font_01_sfnt_off000082f1.bin
319ff1ed6328dbbebbf52afc1a8de417ef454546b1ab07dd80ca63f2f97329c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x82F1 10408 bytes
font_02_sfnt_off0000a688.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0xA688 4324 bytes