Malicious PDF — malware analysis report

Static analysis result for SHA-256 9319be5167eaf6bc…

MALICIOUS

PDF

37.5 KB Created: 2020-08-30 04:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7c7056cead1c6777781269e33eb9f43 SHA-1: 738d9a9f8e24a3dbc2ef789653a8a01006b81202 SHA-256: 9319be5167eaf6bc5f6839fe05b70e72b709b14a244187b755000152fe89fba2
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of external links, many of which are part of a link farm. One of the primary links directs to a known malicious redirector service, 'ttraff.me', which likely serves as a gateway to further malicious content. The document body contains garbled text but includes the URL that triggered the redirector heuristic.

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/wix?keyword=printable+machine+screw+size+chart
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/bottom_of_the_pyramid_ck_prahalad.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/83826503913.pdf
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/rogawski_calculus_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0439/4346/1032/files/bloodrayne_2_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0445/5153/6799/files/convert_html_to_react_native.pdf
    • https://cdn.shopify.com/s/files/1/0430/3391/9645/files/31508720518.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/boosting_confidence.pdf
    • https://cdn.shopify.com/s/files/1/0435/3386/1018/files/tybcom_syllabus_mumbai_university_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0434/3595/0236/files/wigob.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd79669ea32441c2a7b886e7b9b0e282.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e7b835acf0f44239cc725af5a94123b.pdf
    • https://static.usrfiles.com/ugd/b8c837_03f51cecd1f14850b602826146c68541.pdf
    • https://static.usrfiles.com/ugd/b8c837_10652fbe467042b9abcc3c2e15ae83d0.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/84441936923.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9621/files/15565983774.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/38326730735.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/wakaponomapokajorupopi.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_off0000556a.bin
51968b39ac8185305e6b6367e156ea90e7b92f3eb22f6503fbb0067b0bd9a3aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x556A 5324 bytes
font_01_sfnt_off00006763.bin
29fe9d9eb8b38b63b90cbb2b16b30659d075ac07650e348db8246497e2f39768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6763 9796 bytes

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