Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf732dceeb46b264…

MALICIOUS

PDF

46.6 KB Created: 2020-08-06 00:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a3df29e8695ddafd32cdcccc9a9899 SHA-1: 8da07590e9c901065aee62db8b007d30530df060 SHA-256: bf732dceeb46b264b0f83dc5a1ea33238396f97956a7d0c87e68f63150cf61e8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, suggesting an attempt at SEO manipulation or a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=czasy+przesz%25C5%2582e+angielski+tabela+pdf'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and heuristics point to a malicious redirection scheme.

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=czasy+przesz%25C5%2582e+angielski+tabela+pdf
    • http://files.hchsmusic.com/uploads/1/3/2/7/132740930/kifemopivod_gusozo_gajiz_wafelefeleg.pdf
    • http://pokepula.thedesignco-op.com/uploads/1/3/2/6/132681556/02adfd2c323c.pdf
    • http://mitubav.southeastchristianmn.org/uploads/1/3/0/7/130776208/805096197f.pdf
    • http://files.jjsdka.org/uploads/1/3/0/9/130969819/98a098cf.pdf
    • http://files.kashimondojo.com/uploads/1/3/0/7/130739772/ad7ac.pdf
    • http://mitubav.southeastchristianmn.o
    • https://cdn.shopify.com/s/files/1/0437/2060/5848/files/49833002524.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0553/files/office_xp_service_pack_3_error_0x80096004.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/dujarakokepimumeweredepen.pdf
    • https://cdn.shopify.com/s/files/1/0432/0110/1985/files/lunasapote.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/zion_watchman_campground.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40035930655.pdf
    • https://cdn.shopify.com/s/files/1/0432/4913/9880/files/11568419411.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/jivalolojofupaninigupowuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/xumegofadowotevadatifusaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5071/files/setelasusubadazosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1219/3438/files/66788042370.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/tovajopapilunaxenukeluxef.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_off00007316.bin
f18d0d49355e41ef0d00b8b840e9eb208ebb1cb55f41c1910a06be84a0be4bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7316 5528 bytes
font_01_sfnt_off00008604.bin
a0abed3fbae491982bb37e68fd5c40d326ea32745082ed48acc84426524e9efa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8604 11448 bytes

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