Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d9f9a26c0df542…

MALICIOUS

PDF

44.6 KB Created: 2020-09-12 13:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca82e5adf37effcb86895a3ac5a9aba2 SHA-1: 28e221000ac237844e33b059bead7a1da86b17d1 SHA-256: 54d9f9a26c0df5423dc1abe0d6af4f73faa8aea6287c9b1257ac413c95898894
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 external PDF files. One of these links, https://ttraff.club/pify?keyword=what+do+mealworms+turn+into+answers, is flagged as a malicious redirector. The document body is heavily obfuscated and contains the same URL, suggesting the primary purpose is to redirect users to potentially malicious content through a link farm.

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.club/pify?keyword=what+do+mealworms+turn+into+answers
    • http://files.rebeccakastleman.com/uploads/1/3/1/4/131438419/2747017.pdf
    • http://wobedum.theputneypolestudio.com/uploads/1/3/1/3/131380594/pudozobupi-baweg.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/5905539051.pdf
    • https://cdn.shopify.com/s/files/1/0484/9762/3190/files/seguwenuzo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1265/1170/files/tawenebuj.pdf
    • https://static.usrfiles.com/ugd/7a359d_79f6b14702ff476f869706f9c0ad031e.pdf
    • https://static.usrfiles.com/ugd/a4e402_34fec47843c84746872d51a73249c386.pdf
    • https://static.usrfiles.com/ugd/b09e1d_f6cd759f4dd342f4a59780f5a13f3bd9.pdf
    • https://static.usrfiles.com/ugd/6a44d8_b7b4516e3e29430c9512d1ce7504c5a7.pdf
    • https://static.usrfiles.com/ugd/409ca8_44bbad5089184300bf03dc5dcd114f88.pdf
    • https://static.usrfiles.com/ugd/70c1f8_a14d55ad9c174dee871697c2bb44f871.pdf
    • https://static.usrfiles.com/ugd/e6e573_67db4e2346f0452e8b5dffb08cd8134d.pdf
    • https://static.usrfiles.com/ugd/bae0a0_2459a5ac654c4875ab303cbac1e75279.pdf
    • https://static.usrfiles.com/ugd/6da380_5db5b292876f4fcd926dce615ba01322.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067ce.bin
0354a9c50f02db6347cd60e45ca0bdc44b0b4bafed61542e2555f4f6f7596eb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x67CE 5172 bytes
font_01_sfnt_off00007944.bin
70b844f74996fcee5e1d27ce90af7085dab18ef8498285b96f5f41c426451930
pdf-font-stream PDF embedded font (sfnt) at offset 0x7944 1716 bytes
font_02_sfnt_off000081ea.bin
8036d0fd5f2ac16d5d000415f69e697dd3370448ec49aa4f57b6a54c13d80235
pdf-font-stream PDF embedded font (sfnt) at offset 0x81EA 10348 bytes