Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9b6cc6e65d8aaa…

MALICIOUS

PDF

42.6 KB Created: 2020-08-12 09:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d19e15684a14a27bfbdc15a8dde56bc0 SHA-1: 74b40e720bd7f7082221156342bf007c1bfc2b19 SHA-256: 1b9b6cc6e65d8aaa5efe16c1d0c104240f0114401e9364256ad7a794083e2206
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that leads to this redirector. The primary goal appears to be directing users to malicious content through a link farm strategy.

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=neoliberalism+international+relations+pdf
    • http://gazawuzo.totalfireprotectionsd.com/uploads/1/3/0/9/130969352/aebd1f444639e6.pdf
    • http://kozupuj.aauwbakersfield.com/uploads/1/3/0/7/130775934/1319687.pdf
    • http://kofejidu.vocalbreeze.org/uploads/1/3/1/4/131438392/pelojokalepivikeb.pdf
    • http://files.ps76q.org/uploads/1/3/1/3/131379037/vusavumu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5612/8412/files/mofuwidewu.pdf
    • https://cdn.shopify.com/s/files/1/0446/6917/3923/files/contabilidad_administrativa_ramirez_padilla.pdf
    • https://cdn.shopify.com/s/files/1/0437/5068/6874/files/unity_screen_shake.pdf
    • https://cdn.shopify.com/s/files/1/0445/3921/6036/files/domestic_animals_pictures_chart.pdf
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/override_past_tense.pdf
    • https://cdn.shopify.com/s/files/1/0432/2669/3789/files/93327713893.pdf
    • https://cdn.shopify.com/s/files/1/0433/3279/6574/files/2155968668.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/16765668117.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/14847982439.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5602/files/vogirudekujidezez.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/fuvitixamelirizu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7992/4902/files/41858290406.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000677f.bin
d84cbea27e5c06690f802a595c3107574a83d16aad4adf03aceb7915afd42386
pdf-font-stream PDF embedded font (sfnt) at offset 0x677F 5296 bytes
font_01_sfnt_off0000795d.bin
fdf61e7e87bb825d0b6222cb72471c67318fbdbb65b09013750399234fe5d5e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x795D 10640 bytes