Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1bc54a383c7620…

MALICIOUS

PDF

32.3 KB Created: 2020-10-31 22:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ed1a69ccfa14af73b55fbb7296dc151a SHA-1: dfa9d4f74e231d14715a705c1041024364eea739 SHA-256: 8f1bc54a383c76200d239ee5188ae41942c3322e3ab574600b9d5b4609c32821
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded links that are identified as malicious redirectors. The document body, though partially corrupted, suggests a lure related to 'cellular respiration cricket lab answers' to entice users to click the malicious links. The ML classifier strongly indicates maliciousness, and the presence of multiple links to disposable hosting further supports a malicious intent to redirect users to potentially harmful sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/123?keyword=cellular+respiration+cricket+lab+answers In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kumawejegatamaxu.pdfIn PDF document text
    • https://soxawanijisal.weebly.com/uploads/1/3/4/5/134513704/019ed2f52.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/4230063.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/9300333.pdfIn PDF document text
    • https://xitemexum.weebly.com/uploads/1/3/4/3/134311382/fovebuz.pdfIn PDF document text
    • https://loroxiboziniluz.weebly.com/uploads/1/3/4/4/134402159/828831.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/810577fb-b4f7-457a-a8b4-006c5bbe6959/the_mans_guide_to_women.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/6118/8005/files/mhw_coral_orchestra_iceborne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a05221-4277-46a6-8d6d-e44a19fe4500/julius_caesar_modern_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a64255a-3edd-411c-a832-0159e6e42a74/85721124970.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/37378166223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc1dec4-2c88-4c94-8747-b7f4f3c625fc/29040309859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4fd80ed-116f-43fb-9bd8-730108852e27/jomugadolufezog.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 8

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_off0000454a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x454A 5128 bytes
SHA-256: c85c1e5fe346f8b41419d5091c4896da2533873d557c8d9bee6b0f29c295872e
font_01_sfnt_off000056d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56D8 8560 bytes
SHA-256: a1d37fe748eccd070b343e5c4d0aae486c015757cd1b5172fecc97780adf2f74

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