Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d7aa6c44b0fbb2…

MALICIOUS

PDF

56.7 KB Created: 2020-08-11 09:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 161acfb8d21acbe2ee76cb37ece11c16 SHA-1: a88a6e26b22cb15cf505c082b395e19ba6d50750 SHA-256: 82d7aa6c44b0fbb219e52d8d146e8c6562a53a736622ebf0b067085ee6927f12
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 a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same lure text and URLs as found in the heuristics, indicating an attempt to disguise malicious links as legitimate content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=positive+effects+of+globalisation+in+education+system+pdf
    • http://files.benbloor.com/uploads/1/3/1/4/131483955/visujulorefu.pdf
    • http://bodawot.targetmarketingmedia.com/uploads/1/3/1/8/131871462/181b713be28dc2.pdf
    • http://files.gracebecker.org/uploads/1/3/2/7/132740488/morupiwop-ropamazemoru-moven.pdf
    • http://xepowuk.lifelybali.com/uploads/1/3/1/6/131606066/3351185.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/banota.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/gufisinizagu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3197/8403/files/laporan_pendahuluan_hernia_umbilikalis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6701/5329/files/ppmt_function_excel.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/boy_s_life_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0856/files/17258405638.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/47644807788.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/busugalirifizowipu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5560/2078/files/ditonunezarus.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/48603283215.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/29883963658.pdf
    • https://cdn.shopify.com/s/files/1/0429/0274/9347/files/behavioral_cognitive_neuroscience.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_off00009ddb.bin
f5d462bfcf235ddc80edfdf1c09445f9dc28098c9a5fdc4247c44c0ab0d747fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DDB 5684 bytes
font_01_sfnt_off0000b12d.bin
291fa5df842f4165cd48e5428ac3a211d3f6fc27b375662a08d7acf49827b3ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xB12D 10472 bytes