Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efdb634996e8919…

MALICIOUS

PDF

45.1 KB Created: 2020-08-08 13:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16aa862c82fc254aeda3a64325583978 SHA-1: 0261d637ed126b409b735d4ada83d23c9030d951 SHA-256: 9efdb634996e89196ed4d6ec07414a21944307f0d9686acc0ce77a816eda9a87
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic firings indicate this is a PDF link farm, likely designed to manipulate search results or redirect users to malicious sites. The ML classifier strongly supports the malicious nature of this document.

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=acad%25C3%25A9mie+fran%25C3%25A7aise+dictionnaire+pdf
    • http://files.readyourbookcase.com/uploads/1/3/1/3/131398542/navalikufan.pdf
    • http://fetidi.paulmmallory.com/uploads/1/3/1/3/131379803/9e2673fdd.pdf
    • http://rupumes.luxuryfurniturewarehouse.com/uploads/1/3/2/6/132695663/6351348.pdf
    • http://files.grasshopper5k.com/uploads/1/3/2/6/132695325/sabafev_tosefefovan_pelitudifilo.pdf
    • http://files.colleensidey.com/uploads/1/3/1/4/131407952/jafatureriw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4596/1383/files/97679003130.pdf
    • https://cdn.shopify.com/s/files/1/0438/4296/1570/files/dungeons_and_dragons_5th_edition_bestiary.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/24790424812.pdf
    • https://cdn.shopify.com/s/files/1/0443/0397/4556/files/classic_warrior_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/vomalajemegoliga.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/project_report_on_work_life_balance_of_employees.pdf
    • https://cdn.shopify.com/s/files/1/0428/6667/1782/files/buzalaxevunologudidel.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5501/files/wine_cellar_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9351/files/how_to_craft_chainmail_armor.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/nebedanitikofipawaki.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_off00006e35.bin
cefb36efc8504e1f4ec21187f8c1698d70c25bef894bc824da5ef54119d3f373
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E35 5584 bytes
font_01_sfnt_off0000809b.bin
86ab57634132d3ca2b1500026a0fab4b6983e3ff46ccf763bf292c17aa41d33d
pdf-font-stream PDF embedded font (sfnt) at offset 0x809B 11700 bytes