Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3f8e02bea590b4…

MALICIOUS

PDF

43.6 KB Created: 2020-07-09 00:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 357d09d2b01c481a066a1da6f1c155a2 SHA-1: d7f7546c252efc0a341638c797d06cf469ee679a SHA-256: 1c3f8e02bea590b4231bc9c3e2c2b5f9f36fd22bab24a5dea4a0b9e81584f02e
152 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, many of which point to domains that appear to be part of a link farm or SEO manipulation scheme. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The document body text, while partially obfuscated, includes the phrase "mobile repairing course pdf" and the malicious redirector URL, suggesting a lure to entice users to click on the links. The ML classifier 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.cc/wb?keyword=mobile%20repairing%20course%20pdf
    • http://files.dcaaems.org/uploads/1/3/2/8/132814523/81e6d.pdf
    • http://files.keriakvirginhair.com/uploads/1/3/2/6/132681757/vepemoju.pdf
    • http://files.alphaplt.com/uploads/1/3/2/6/132682639/1723588.pdf
    • http://files.room4love.org/uploads/1/3/0/8/130874458/koban_subozad_lalak_wifufup.pdf
    • http://files.reclaiminghopecounseling.com/uploads/1/3/2/6/132681245/239b840ef9eb.pdf
    • http://files.gardenvalleygatherings.com/uploads/1/3/1/3/131398540/rimivuna.pdf
    • http://files.merrifieldseminar.com/uploads/1/3/2/7/132710655/7749287.pdf
    • http://files.lightningridgerealestate.com.au/uploads/1/3/2/8/132815961/tuwor.pdf
    • http://files.raleighmoravian.org/uploads/1/3/1/6/131637092/zavokebofakapez-labukoke-guvarasadojut.pdf
    • https://vodefewosiru.files.wordpress.com/2020/06/vujunubomukaguju.pdf
    • https://bofifepero.files.wordpress.com/2020/07/doxiwerutigugosumukuz.pdf
    • https://lavodidanu.files.wordpress.com/2020/07/25382387295.pdf
    • https://faxonitu.files.wordpress.com/2020/07/pubejososasiletesekupusi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wanojexabe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofusibosaduxigagixuvoma.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98629167596.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_off00006662.bin
0c7deab2b9f4beeb6cd6fd7e0cdd662c6d6841efdf752f7e2262fdd4bccd9729		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6662 5272 bytes
font_01_sfnt_off0000784b.bin
76d4affb04e2082c943911728c9d947c21c115982b104940ab229225e516d7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784B 12904 bytes

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