Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a81144853acf5c…

MALICIOUS

PDF

55.7 KB Created: 2020-08-11 15:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fd7ebaf088584f12fca38b137f8602c0 SHA-1: 761468f0b1ece9bd4a6e5c1c496cf6877ca61577 SHA-256: 55a81144853acf5c1fa89d11b9d61a46799a9e11f7c70f0fb65c9c64802b8fce
194 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a lure for accounting books. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM firings indicate that the document is designed to lead users to malicious infrastructure. The primary malicious IOC is the redirector URL.

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.ru/pify?keyword=download+buku+akuntansi+perusahaan+jasa+pdf In PDF document text
    • http://files.calhounproduce.com/uploads/1/3/1/8/131871462/tijama.pdfIn PDF document text
    • http://files.renewalskinandbody.com/uploads/1/3/1/8/131857758/7956443.pdfIn PDF document text
    • http://files.idyllicvista.com/uploads/1/3/1/0/131070845/sukogezog.pdfIn PDF document text
    • http://files.pilgrimagetobeauty.com/uploads/1/3/1/3/131384374/3113166.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/1/0431/6332/0469/files/ranutexu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/photoshop_portable_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8867/4967/files/884266469.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vibemegabixowosepabotabux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2108/9444/files/coreldraw_2020_shortcut_keys_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/functions_of_nouns_worksheets_for_grade_6_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/3904/2205/files/chabahar_port_vs_gwadar_port.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1167/8114/files/monatorebure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/19567580980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5021/3274/files/7056055749.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.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 4

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_off00008dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC5 5500 bytes
SHA-256: f6a065852b3c4bcefc5450d71f92c5ba280dc107aa7bb6d19485f88bb2d31545
font_01_sfnt_off0000a088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA088 15920 bytes
SHA-256: 712d002cde6633e58a4542170ed23fb7a7d9caacf12f5c6e38a12c3f925aaa18

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