Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a035bd21b4de41…

MALICIOUS

PDF

47.1 KB Created: 2020-08-19 23:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13fdc49d8c0fbcfbebb04aa4a29e2e75 SHA-1: 38674e9053d6b11daae70d513b41d400a1ffc5ea SHA-256: 04a035bd21b4de41ecf8e8e7e6e82bc965380e5c7ba23244335458054c48ffe1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate documents but lead to potentially malicious or redirector sites. One URL, https://ttraff.com/pify?keyword=bithiri+sathi+bathukamma+song+2018, is explicitly flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=bithiri+sathi+bathukamma+song+2018
    • http://files.fallsevengetupeight.com/uploads/1/3/2/7/132740711/8011113.pdf
    • http://files.strawberrygoosephotography.com/uploads/1/3/0/7/130739971/1477950.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/laxozinetagoladewuri.pdf
    • https://cdn.shopify.com/s/files/1/0431/7154/5237/files/xelabopinexixaxumad.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/universal_antidote.pdf
    • https://cdn.shopify.com/s/files/1/0439/8520/7454/files/jofafodoleme.pdf
    • https://cdn.shopify.com/s/files/1/0431/3920/3229/files/abstract_algebra_hungerford.pdf
    • https://cdn.shopify.com/s/files/1/0428/4140/7644/files/inductive_deductive_and_abductive_research_approach.pdf
    • https://cdn.shopify.com/s/files/1/0431/8111/3506/files/if_i_tremble_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/9526/8264/files/lenizurot.pdf
    • https://cdn.shopify.com/s/files/1/0438/4161/8082/files/brunner_and_suddarth_11th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0305/1171/files/zozawag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f46.bin
64489402fd6e7a2afe107af6eeb40cb5a47095c843149603aa4bb1a54b3ba4d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F46 5840 bytes
font_01_sfnt_off00007304.bin
f1f47d1702f2b1dd7c95f259828d0c705cd45190ed4120f8145fa2d2d29d68c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7304 6644 bytes
font_02_sfnt_off000088fb.bin
948133f88697365346719a7aa781f6c79041f311ac305e3aed95252cecd7a594
pdf-font-stream PDF embedded font (sfnt) at offset 0x88FB 12024 bytes