Malicious PDF — malware analysis report

Static analysis result for SHA-256 8988e096b4f7ce27…

MALICIOUS

PDF

36.9 KB Created: 2020-08-10 09:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61e16a3cedc9615f24ebe5725eb929bd SHA-1: f48601d2b3dd653b5f7fd3b16fe964aa3aeb1c8d SHA-256: 8988e096b4f7ce278a58064f9eb49ff7b84944859f7a616fa046180cbf56197b
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which is further supported by the presence of numerous embedded URLs. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=psychology+book+pdf+class+12'. The document body, though heavily obfuscated, contains text related to 'Psychology book pdf class 12', suggesting a lure to entice users to click the malicious link. The file also exhibits characteristics of a link farm, with many external PDF links.

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=psychology+book+pdf+class+12
    • http://files.creativekco.com/uploads/1/3/1/4/131437775/zupibo_terebo_tinewabaput.pdf
    • http://files.arlenhancockactor.com/uploads/1/3/1/1/131164152/4108555.pdf
    • http://files.ttbami.com/uploads/1/3/1/4/131437984/junukibiwuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/kopivenura.pdf
    • https://cdn.shopify.com/s/files/1/0430/4125/9671/files/el_quijote_apocrifo_de_avellaneda.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/73717926484.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3406/files/nuwaboloxokenuripekozuvow.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/prot_warrior_pvp_talents.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/nazododasefu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6332/6358/files/nico_bellic_soundboard.pdf
    • https://cdn.shopify.com/s/files/1/0434/0406/6983/files/navowedetatebufidu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1395/files/kufato.pdf
    • https://cdn.shopify.com/s/files/1/0439/5030/9531/files/pumaxax.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/cultural_ecology_example.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_off00005103.bin
b830adae54b623f08a4a16b24d48f717ea1c6438878fc42e5492c5c8b9b5ece7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5103 5812 bytes
font_01_sfnt_off000064dc.bin
ee610ff504ded15d4d1db93fdbaf12215cc710cc01b128e0b3e510c978aa0eac
pdf-font-stream PDF embedded font (sfnt) at offset 0x64DC 9884 bytes