Malicious PDF — malware analysis report

Static analysis result for SHA-256 0359930880e99e4b…

MALICIOUS

PDF

68.7 KB Created: 2020-08-27 00:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d9e140f9fd02d569f1e274c08b4a3fc SHA-1: 0c83e2114f615f4961a3d5bbaf3a86b86718f6ac SHA-256: 0359930880e99e4b4b3fbb70dbfaf888260c335a5f038e468129b6030c78f234
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.me/pify?keyword=a+wrinkle+in+time+book+audio+chapter+2', is flagged as a malicious redirector. The document body, though partially obfuscated, also contains this URL, reinforcing the lure. The ML classifier strongly indicates 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.me/pify?keyword=a+wrinkle+in+time+book+audio+chapter+2
    • http://files.yoonoptometry.com/uploads/1/3/1/1/131164488/9ce12c582.pdf
    • http://files.synapticbiology.com/uploads/1/3/2/6/132681556/jukipida_feses_fewezapulu.pdf
    • http://files.longtabbrewing.com/uploads/1/3/0/8/130813616/sibekabozorase.pdf
    • http://files.abaofillinois.org/uploads/1/3/0/7/130739746/3066846.pdf
    • http://fegirun.kl-creation.fr/uploads/1/3/2/6/132681670/wewitajuti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/briggs_and_stratton_engine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/ridowirimen.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/vitatotebudusaxoxazip.pdf
    • https://cdn.shopify.com/s/files/1/0461/4245/5961/files/tuduvevovizapova.pdf
    • https://cdn.shopify.com/s/files/1/0437/7955/5486/files/zedevixixekibelapugufas.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/begotusavoko.pdf
    • https://cdn.shopify.com/s/files/1/0433/8188/3047/files/simple_biodata_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/chemistry_formulas_for_class_11_and_12_cbse.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bararilisubolubudikolumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1523/2923/files/1449867798.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/12428936125.pdf
    • https://cdn.shopify.com/s/files/1/0431/2236/0481/files/notibijapunopikumapoxun.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/wefusasurarukusopuralin.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
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c088.bin
3ea70e8c6c6a211901c3d707485c89372be86342a04a49b2518592c722562986		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC088 5552 bytes
font_01_sfnt_off0000d340.bin
bb9d15ca340f8fca0c151d8534d8e08d239d2cd4571a3b13315662a2738d3949		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 10076 bytes
font_02_sfnt_off0000f5bb.bin
a41a9b75a3270afc0c7cabf0b42dff6ef9cf04a079a02c61ec1f27dec6ee85f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 6152 bytes

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