Malicious PDF — malware analysis report

Static analysis result for SHA-256 016f94f64a410c80…

MALICIOUS

PDF

38.5 KB Created: 2020-08-27 13:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 769941adc9558ad9de693716adb04aea SHA-1: 3fc6939c0beec87cd938810068544ade0c7a9263 SHA-256: 016f94f64a410c80182959625159664606c48c6476013247d9148f06793cdd6f
162 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting other PDFs, characteristic of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=harkness+discussion+rubric'. This suggests the document's primary purpose is to lure users through these links, likely leading to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=harkness+discussion+rubric
    • http://latekume.souliciouslifestyle.com/uploads/1/3/0/7/130739379/goxoronaroki.pdf
    • http://lufuf.ridgefieldanimalhospital.com/uploads/1/3/1/4/131438539/f641bb18930e55.pdf
    • http://files.ecoswapstore.com/uploads/1/3/2/7/132710592/1012338.pdf
    • http://jafit.authortaradawn.com/uploads/1/3/0/7/130776394/a22285c1.pdf
    • http://rumujis.zacharywollert.com/uploads/1/3/1/1/131163983/9d8777c0ba5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5528/3350/files/tatigoxoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7915/files/sazatifinojapisik.pdf
    • https://cdn.shopify.com/s/files/1/0434/4669/8146/files/86918421989.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/duneji.pdf
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/bejigipokera.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/vibutadajupib.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/kurose_and_ross_computer_networking_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/2658/7549/files/70647958097.pdf
    • https://cdn.shopify.com/s/files/1/0439/1796/7528/files/62024867461.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7394/files/56828979655.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_off000057ed.bin
ca410086cc3fca48a4fb4c7e04a259025ee775fcca6dca2b2f3e3c8d136cdd94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57ED 5064 bytes
font_01_sfnt_off00006925.bin
687a2743c17d00a6dac3224305ed391cdb2bc425d442befc8cfcd2beca4a6b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6925 10236 bytes

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