Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01151b21542b992…

MALICIOUS

PDF

34.4 KB Created: 2020-08-13 05:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dafc76d6078fa2e2aa2b5a30f2e733c SHA-1: 8fbad6c75410290494769acacb0e05f7b512a7fe SHA-256: b01151b21542b992898e63c742adced4b91f538123cf4971663c97c6f23d0ffb
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the text 'Twin lens reflex camera manual' and the malicious redirector URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=twin%20lens%20reflex%20camera%20manual
    • http://files.calcoastalhorserescue.com/uploads/1/3/1/4/131412558/sivoto.pdf
    • http://files.ericaveryartist.com/uploads/1/3/0/7/130775867/jedaxixabaxeza-kubazo-xikoz-fegonetazowuseg.pdf
    • http://files.energyharmonybalance.com/uploads/1/3/1/4/131483097/nokamow.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/vulopumefudalezeseliv.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5885/files/56096657202.pdf
    • https://cdn.shopify.com/s/files/1/0440/6856/9238/files/tagob.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0413/files/vaziburelijumizudesiwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/approach_definition.pdf
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/wowaledoribodigi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8513/5014/files/majedofejarakisomulod.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/operatoria_dental_barrancos_5ta_edicion_descargar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/amazon_in_2020_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0431/4005/5208/files/pukolef.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4023/files/human_anatomy_marieb_free.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_off00004745.bin
2bc1e2ea4b12b6b7dcc8cc2124812a7ffaf2dced3b879fc0014772ecda44746c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4745 5136 bytes
font_01_sfnt_off000058ad.bin
d5bc368abb5da8ae36fbdc0436b2aa114aaf094d14cfb95569e9f6392f5dfd9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x58AD 10744 bytes