Malicious PDF — malware analysis report

Static analysis result for SHA-256 f924a24ff8f387c8…

MALICIOUS

PDF

42.7 KB Created: 2020-08-06 18:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fca02e93f48733c4041eba0934011646 SHA-1: d50ab00956c958544b9cca975d1ab9359ab165f2 SHA-256: f924a24ff8f387c8371b920bba57d97fefe929cfd2bd1bc5580c15a9c156fdd2
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as educational resources, specifically a 'Class 9 10 biology book pdf'. The primary link, https://ttraff.cc/pify?keyword=class+9+10+biology+book+pdf, is identified as a malicious redirector. This indicates a social engineering attempt to lure users to malicious sites under the guise of providing study materials. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

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 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.
  • 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=class+9+10+biology+book+pdf
    • http://files.gbyws.org/uploads/1/3/1/4/131483019/paludizixi-pazibokadelok-xovubonavegazuz-nobuxudisapefod.pdf
    • http://files.healthydiet4you.com/uploads/1/3/1/4/131453354/mevujewo-finotixusizo-wafij.pdf
    • http://files.mdesignslincoln.com/uploads/1/3/0/7/130740213/mominekejapunuvevu.pdf
    • http://bujirivu.milesgreenberg.com/uploads/1/3/2/6/132682051/0759df6ec54.pdf
    • http://files.myhealthaccel.com/uploads/1/3/1/3/131384173/wukasakedepe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8118/files/86422982685.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7672/files/53359545493.pdf
    • https://cdn.shopify.com/s/files/1/0432/6775/2099/files/23392182390.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6018/files/7281997131.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6273/files/74293872942.pdf
    • https://cdn.shopify.com/s/files/1/0439/7914/5374/files/tosipixeziwesinenare.pdf
    • https://cdn.shopify.com/s/files/1/0435/9127/0563/files/ashrae_standard_55_1992.pdf
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/waled.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/44690616074.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/neverwinter_character_creation.pdf
    • https://cdn.shopify.com/s/files/1/0434/7848/3096/files/37793014044.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bb3.bin
9aba27df82ad712eda64805837603e371d5e2b50b7f268c53bf23d7e8c1eea66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB3 5276 bytes
font_01_sfnt_off00006daa.bin
b905664e86ed4b63b884fd1f1e28361b7e83c438dde05aad02befb1c15ee2745		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAA 10048 bytes
font_02_sfnt_off00009005.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9005 4324 bytes

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