Malicious PDF — malware analysis report

Static analysis result for SHA-256 732e99e97e03a365…

MALICIOUS

PDF

39.4 KB Created: 2020-08-11 21:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58d2f3f568399012a175a13420983d58 SHA-1: 1d7831708411a7521e342e52f098c2a65d4edfa0 SHA-256: 732e99e97e03a3658d7b22d82c006e969e3f9e4935e00e8348d983012116bfd0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, classifying it as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful sites. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the primary function appears to be redirecting users through a network of links, potentially for SEO manipulation or to distribute further malicious content.

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.ru/pify?keyword=oxford+online+placement+test+sample+pdf
    • http://xokalijo.adldpk.org/uploads/1/3/1/3/131380600/ec7661ecb7.pdf
    • http://ludus.thatspeechlady.co.uk/uploads/1/3/0/9/130969204/burukekibefodumet.pdf
    • http://files.teammissionsports.com/uploads/1/3/0/8/130873830/56fd778fc49d11.pdf
    • http://files.singoutasia.org/uploads/1/3/0/7/130776445/a44802a56.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81236671698.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/assurance_automobile_algerie.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/mamotezagoguxowen.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/passive_voice_exercises_mixed_tenses_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/apsale_net_click_115667_9571_art.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/nufutun.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/samuvojel.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8196/files/scholarship_application_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0435/9516/9951/files/tipos_de_actos_de_comercio.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/14506451147.pdf
    • https://cdn.shopify.com/s/files/1/0435/9464/5672/files/lexireparerulubonokeso.pdf
    • https://cdn.shopify.com/s/files/1/0433/1264/4251/files/ansi_c_dennis_ritchie.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/pokemon_nds_rom_hacks.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005994.bin
77f0e5264396d9f5f405f32c5de1143452e9374032cbcda93dbf2d13a56b5eea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5994 5396 bytes
font_01_sfnt_off00006bda.bin
13cf27b17c976cdc9e8f523f3f515727a4b3dd41ab083f6a1653763f3fe03980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDA 10748 bytes

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