Malicious PDF — malware analysis report

Static analysis result for SHA-256 b661d604f7dd570b…

MALICIOUS

PDF

50.9 KB Created: 2020-08-19 18:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ac871871fb3cf449482a66792b38f22f SHA-1: 246512dc097b66020e95d4b16492b0948e777fc4 SHA-256: b661d604f7dd570bc74ca01039051b0a6a93cb8103a497d9338a334b9f12b860
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc' with a keyword suggesting a lure for app downloads. Additionally, a PDF SEO link farm heuristic indicates the document is designed to host numerous external links, many of which are hosted on Shopify. The document body contains the same malicious URL and a list of other URLs, likely part of the link farm. The primary intent appears to be redirecting users to malicious infrastructure under the guise of providing access to 'appvalley android online'.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.cc/pify?keyword=appvalley+android+online In PDF document text
    • http://pazibawup.bagsbytheshore.com/uploads/1/3/0/7/130739654/1528984.pdfIn PDF document text
    • http://files.heatherchrisler.com/uploads/1/3/1/4/131438073/patogidamivog_vuxuzojawabapel.pdfIn PDF document text
    • http://kexome.writerchrissimpson.com/uploads/1/3/0/8/130813765/gedatifimofifa_dipewoxed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/43514806783.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6283/6891/files/pollination_in_plants_video.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0334/6078/files/self_certification_form_nhs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/42847179720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6165/8279/files/veviwupurazavo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/tapugisa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/89745148475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/27106357753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/detakof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0310/7752/files/rewuxivarejagexikenofavow.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a52e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA52E 17380 bytes
SHA-256: 350959d01400f5bad8bc0d16b2757c536353b7c6dbececaa902d42cb8c41693d
font_00_sfnt_off00006f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F23 4924 bytes
SHA-256: c5f70fbae4f976f6eeb143aac6fcd5b2a618c8095d623e6bb0651b4439c2083c
font_01_sfnt_off00007ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF9 10844 bytes
SHA-256: e77017022b9f9ac25359cbb90dc497a1e564c4610b71c2eb2cdf160dbb11d2c2