Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa40ad2a760c12b0…

MALICIOUS

PDF

39.7 KB Created: 2020-08-21 19:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7c7a03d6fcffa89d0237fe9d83954d46 SHA-1: 8738cfd601a096dbdb542de0342abad696e92a8f SHA-256: aa40ad2a760c12b088d48636f78100a4a0bac04862d0bfe1af8b38ff95e30575
202 Risk Score

Malware Insights

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

The PDF file contains a lure for 'free printable math worksheets' which is intended to trick the user into clicking an embedded link. This link, https://ttraff.cc/pify?keyword=free+printable+math+worksheets+elapsed+time, redirects to malicious infrastructure. The file also contains a large number of links to PDFs hosted on Shopify, likely for SEO manipulation or to appear more legitimate. No scripts were extracted, but the primary malicious behavior is the redirection to a known malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.cc/pify?keyword=free+printable+math+worksheets+elapsed+time In PDF document text
    • http://files.pivotalconcepts.com/uploads/1/3/0/7/130739693/jofumenediwe-fefazosenuba.pdfIn PDF document text
    • http://files.andrewmoschetti.com/uploads/1/3/1/4/131454114/fipuw-kivopatilawo.pdfIn PDF document text
    • http://files.recessionals.org/uploads/1/3/0/8/130874122/pipadapef_baxixasar_numetifibodukat_bojakaxexedamu.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/1/0440/0257/4494/files/12796357640.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2857/8467/files/lavigekalarutufuji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1509/3924/files/45252323339.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/1480/2855/files/colouring_sheets_animals_hard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4940/2024/files/28917097595.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/5827/8050/files/fast_reader_linux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1397/1861/files/57330172650.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/69104129296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5376/8090/files/raluvatugimex.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://scripts.sil.org/OFLIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58EC 5448 bytes
SHA-256: 4381abff39625855e2776a8ebdf701910e07db1657e44a71758d5bb67644d69b
font_01_sfnt_off00006b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4B 11524 bytes
SHA-256: 41288c760ed9d83a1356f2e3049095ca70228c115766b90c8c4c29a7fe2f0d3d

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