Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b5b5f5bea830ce…

MALICIOUS

PDF

48.8 KB Created: 2020-08-09 23:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1578efb1abbb92199f79eaecaf9cbaaf SHA-1: 8931417c3bfa6fd4740dafb5d8047b6be08885a1 SHA-256: 26b5b5f5bea830cea52324aead70de10841b0c62196651f43a345adea27696b2
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, a technique often used in link farms to artificially boost search engine rankings or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'news writing exercises' and 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.com/pify?keyword=news+writing+exercises+with+answers+pdf
    • http://files.pilotmissionarybaptistchurch.org/uploads/1/3/1/6/131637171/6780717.pdf
    • http://tixakaj.kieraotooleartist.com/uploads/1/3/1/4/131483083/3891365.pdf
    • http://files.artneverdies.com/uploads/1/3/1/0/131070187/1083514.pdf
    • https://cdn.shopify.com/s/files/1/0437/2611/0885/files/41707942764.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/web_to_converter_chrome_extension.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/65743451212.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/1134698611.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/81328234707.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/joguvolemakil.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/24990778882.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/48675766747.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/piboxetupenijawukuloxitu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9800/files/dedepumobidenozikok.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6966/files/toweguvosipi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/67203547701.pdf
    • https://cdn.shopify.com/s/files/1/0436/1424/0931/files/15123060182.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007410.bin
42ecff5a31ad40f386ef456e54e52ea1f9d9a66d485b55fa2446befdee21fca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7410 5192 bytes
font_01_sfnt_off000085c9.bin
c9a104cf620ffef2cbfe7fb8a6078808bec20ff6348a62cb25ba0093685f9054		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C9 9912 bytes
font_02_sfnt_off0000a799.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA799 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.