Malicious PDF — malware analysis report

Static analysis result for SHA-256 165506320500e0d1…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 04:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5f3b9a28a527796267c6bc443f403f5 SHA-1: a02ddd814ff78ceef57fb50146d6f00182510a66 SHA-256: 165506320500e0d1445c57a592c1ceeb5966a05eaa9a462fa3551a54ae333f1e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one specifically identified as pointing to known malicious redirector infrastructure. The presence of a large link farm suggests an attempt at SEO manipulation or distributing malicious content. The ML classifier also strongly indicated 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.ru/wix?keyword=pink+and+white+frank+ocean
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3276/3816/files/xilunoxoxeverisivi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1347/0365/files/fogejikomabolobojix.pdf
    • https://cdn.shopify.com/s/files/1/0430/9513/0266/files/angle_bisector_of_a_triangle_answers.pdf
    • https://cdn.shopify.com/s/files/1/0452/5775/2733/files/riwobinezubuxalanok.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/nukavufozibejuli.pdf
    • https://cdn.shopify.com/s/files/1/0448/1410/6775/files/bhartiya_kala_ka_itihas_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/88013739866.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834814971b8414ca577aa28b115deb1.pdf
    • https://static.usrfiles.com/ugd/ae15ca_cdd184e4e73c4526a79ee688992534f4.pdf
    • https://static.usrfiles.com/ugd/dd4472_5473ed4746c14ae5a9da700ec58926e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae5f3e1cbf8447b7ab0616285f8b1dff.pdf
    • https://static.usrfiles.com/ugd/7f16bd_7514b37270e24bfcadcf354cce15ceca.pdf
    • https://static.usrfiles.com/ugd/4d400c_c2f77d2c1fcb4c48bc44609c57c4bd77.pdf
    • https://static.usrfiles.com/ugd/45e30f_9badaf316e8d40e58f1e05b628b5741d.pdf
    • https://static.usrfiles.com/ugd/77eba6_25fa356120474ac181ea92c077a054f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_3be500aae3ec4f30908e389f6d583f57.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c4c.bin
9d241e8547a40242871c45efed13278fc15b113f43aa9091e1dbe2bd38dafe5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 5056 bytes
font_01_sfnt_off00007d87.bin
c1eb8f9d733b85a7befecb969c4e11fb292ccc2e4fc06b947b5f2655e4e7956c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D87 10076 bytes