Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e1218252580e29…

MALICIOUS

PDF

48.4 KB Created: 2020-08-01 22:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2080bd9cfa681603904708ff5826a1bb SHA-1: eb3314e68461dc7d0b0c503fa3335eabbec940cc SHA-256: d2e1218252580e293c6ec17adaa5af3b8244f8e503cb5848053e4cbf998a0100
154 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 pointing to Shopify domains, which is characteristic of SEO link farm abuse. One of the primary links, 'https://ttraff.com/wb?keyword=control%20system%20engineering%20lecture%20notes%20pdf%20for%20ece', is identified as a malicious redirector. This suggests the document is designed to lure users to malicious sites under the guise of providing lecture notes.

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.com/wb?keyword=control%20system%20engineering%20lecture%20notes%20pdf%20for%20ece
    • http://files.ianthomsen.com/uploads/1/3/0/7/130776745/26651d3.pdf
    • http://files.carmelhill.com/uploads/1/3/0/9/130969434/4160211.pdf
    • http://files.shoultesparkhoa.com/uploads/1/3/1/4/131454221/83f3f67881f2c.pdf
    • http://files.higherlearninginc.com/uploads/1/3/0/8/130874379/purokuj_demiz_filuda.pdf
    • http://files.artofinnerpeace.net/uploads/1/3/0/8/130813988/617207113.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/inverse_gamma_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/649_f_6045.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/63627089541.pdf
    • https://cdn.shopify.com/s/files/1/0438/8211/9323/files/26722821572.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/josoxepevisisix.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/86687667343.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/pipisiranerebizo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6868/6497/files/48157986830.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1121/files/leximof.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/84783369736.pdf
    • https://cdn.shopify.com/s/files/1/0434/4378/1792/files/xaxoboburarobesofeseraz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9087/7339/files/53012016754.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058d6.bin
7c9f74d1c538d0d62a327bb12c19e4e9849c9dc0131f54d2e01920a6b1b1faaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D6 5272 bytes
font_01_sfnt_off00006ab4.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB4 2116 bytes
font_02_sfnt_off0000747e.bin
1665b8ccfa718a416c3e158bd3c84991a0fd5252726ba4190337c96c8f9797c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747E 15068 bytes
font_03_sfnt_off0000a3aa.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3AA 4324 bytes

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