Malicious PDF — malware analysis report

Static analysis result for SHA-256 6969ed851a34d6c2…

MALICIOUS

PDF

40.8 KB Created: 2020-08-21 15:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98514da3b9390bb947349d9950f73c47 SHA-1: 6bd44617524a75c6bb1e8da7871de52d12c36b91 SHA-256: 6969ed851a34d6c29c1b2a90e2ef9831988688c7b1d28ff9c8758ef87a5594d9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to 'grocery list excel spreadsheet' and includes URLs that are part of a link farm designed to distribute malicious content. The ML classifier 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.cc/pify?keyword=grocery+list+excel+spreadsheet
    • http://files.royallegendsvbc.com/uploads/1/3/0/7/130776249/6267038.pdf
    • http://bowutun.placementandbusiness.com/uploads/1/3/2/3/132303230/sizopukav.pdf
    • http://files.mafhaus.com/uploads/1/3/1/4/131453998/wuzepe.pdf
    • http://files.fvmediacenter.org/uploads/1/3/0/8/130813466/xakimev_fufotatigiw_rexivimuborig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0078/9154/files/vce_exam_simulator_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/hey_soul_sister_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/safigobapopegipovofuvixo.pdf
    • https://cdn.shopify.com/s/files/1/0448/4261/4945/files/velejonusarenudarubulexi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72710717911.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/bomivikegivobed.pdf
    • https://cdn.shopify.com/s/files/1/0434/1687/9271/files/beyond_diet_program_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6076/3555/files/92079421172.pdf
    • https://cdn.shopify.com/s/files/1/0429/7991/7987/files/memas.pdf
    • https://cdn.shopify.com/s/files/1/0434/5937/9357/files/sofizi.pdf
    • https://cdn.shopify.com/s/files/1/0447/1622/8761/files/power_glove_terraria.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_off00006231.bin
cc6c89fcfd699ad0419ce0176abe01eb779a7375b637744fac23816e4fb27db0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 5364 bytes
font_01_sfnt_off00007469.bin
5e7b40d4fbaa24e2effbb74ea1928b411a271770a5f43ac9aaa687a40386eeb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7469 9884 bytes

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