Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6f4af572a0e2cf…

MALICIOUS

PDF

46.0 KB Created: 2020-08-20 02:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e6bfc7de7a9a47e30f8949e5023e094 SHA-1: f869dc240619293a07e9ebd8ee0b23e89eec2d14 SHA-256: 1c6f4af572a0e2cfcbdd9fa24d1489abeed2d5ef75e7b32493ecb44676671f07
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a malicious redirector at 'ttraff.cc', disguised as a university guide. This suggests a phishing or social engineering attempt to lure users to malicious infrastructure.

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=cass+business+school+complete+university+guide
    • http://gizuju.ericmccarron.com/uploads/1/3/0/8/130874493/guzawu.pdf
    • http://files.lapasd.com/uploads/1/3/2/6/132681916/3090628.pdf
    • https://cdn.shopify.com/s/files/1/0436/0057/6669/files/time_wasted_on_league.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5195/files/dekinigebut.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/zuvabuxuwana.pdf
    • https://cdn.shopify.com/s/files/1/0428/6208/4262/files/92780824742.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.pdf
    • https://cdn.shopify.com/s/files/1/0431/0374/8263/files/ielts_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/42632204616.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/63619754247.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/tuxodeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9481/9484/files/94124651391.pdf
    • https://cdn.shopify.com/s/files/1/0432/2118/8763/files/adobe_creator_portable.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_off000074ef.bin
0dbb975c96bc5aec2b1fbf03fa468dad580a3cbc1ca9accd07b6608c1719c46d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EF 5696 bytes
font_01_sfnt_off0000881e.bin
859a779c273677f596a133e61a47bc71fd98dfdddab2b8633cb20ba862f3363e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x881E 10304 bytes

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