Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7917432478c930…

MALICIOUS

PDF

38.9 KB Created: 2020-08-19 23:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f9218661fceead39f0178e06ae8f97b SHA-1: fdb8ff6aa34ddf02696520c8b0b37308294e0d74 SHA-256: 0a7917432478c9304375485c4d3e02f67c181f4a49534da55b749f5accaa87c2
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. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirection scheme.

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=android+tutorial+ppt+free
    • http://files.komduurwatersport.nl/uploads/1/3/0/9/130969160/lopetu_debadelokexex_gebum_gagun.pdf
    • http://foposij.moreforlessonline.com/uploads/1/3/1/4/131437254/4701307.pdf
    • http://files.terezinmusic.org/uploads/1/3/0/7/130740044/pewitukuxewusep.pdf
    • http://files.acappella-songs.com/uploads/1/3/0/7/130776826/melomo-velip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7684/5728/files/shear_force_and_bending_moment_equations.pdf
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/zovuxojo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/favojamivozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/sutakazavosabejudirosen.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4496/files/6307675198.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6438/files/nepedeposotofito.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muxolalinurijelibabozafod.pdf
    • https://cdn.shopify.com/s/files/1/0429/1896/9507/files/examples_of_probability_in_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0440/0388/5214/files/gileguliranerapabi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1624/0807/files/23305912777.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5480/files/86022911458.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_off00005b35.bin
da1ca434f8d6570fdcc202011137b0f7edc5fe419b793b06341747461b4bb78f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B35 4848 bytes
font_01_sfnt_off00006bbe.bin
c27820a34e92f8d4307068c13362f3e2455ec2d29fa5ade36195c011f44f94a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBE 10272 bytes