Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f85b436f64ffb3…

MALICIOUS

PDF

43.5 KB Created: 2020-08-23 09:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f244885f9575ccc2fc7950b301ae9274 SHA-1: 628ce6a729e7b69239a2603737c28ad7c7406131 SHA-256: e1f85b436f64ffb3c7542fb41094337fc8a3141bf1b3a69e1f00d27f0e573f9a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, many of which point to domains associated with link farms and redirectors, such as ttraff.com. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting a deliberate attempt to redirect users to potentially harmful content. No scripts were extracted, but the primary attack vector appears to be a link farm designed to drive traffic to malicious sites.

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=court+reporter+salary+2018+california
    • http://lobojax.salemcob.org/uploads/1/3/2/7/132712354/981413.pdf
    • http://muzuwoz.mondaydesignstudio.com/uploads/1/3/0/7/130775478/tujixitogisureb-mokukozagezos.pdf
    • http://makute.geraldsandau-sculpture.com/uploads/1/3/0/7/130775320/4144324.pdf
    • http://xivovum.triplecrownlacrosse.com/uploads/1/3/1/4/131453558/detax.pdf
    • https://cdn.shopify.com/s/files/1/0435/8720/7331/files/muleluxujaniwewo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6372/0613/files/convert_key_to_pem.pdf
    • https://cdn.shopify.com/s/files/1/0432/0323/1903/files/batubobitoxoparoluseso.pdf
    • https://cdn.shopify.com/s/files/1/0431/3851/5098/files/1163254033.pdf
    • https://cdn.shopify.com/s/files/1/0436/6332/7385/files/78605204112.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/real_estate_wholesale_purchase_agreement_contract.pdf
    • https://cdn.shopify.com/s/files/1/0437/7578/7157/files/9113730790.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/gadavilaluxiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0285/files/a_sample_of_slime.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8143/files/fundamentals_of_general_organic_and_biological_chemistry_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/0354/3715/files/41857534906.pdf
    • https://cdn.shopify.com/s/files/1/0437/3771/0744/files/75193975960.pdf
    • https://cdn.shopify.com/s/files/1/0433/7208/5397/files/zewiwiferej.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/witinesefisoroj.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_off000069b4.bin
dd67efdd03319e2f90782f375ee008fa2669ca38b3ad13cc5f0c3deaa78e6b73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B4 5536 bytes
font_01_sfnt_off00007ca5.bin
a255ed66183e6d3ad858b0863e2996c59013c88dc58830020608156488710022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA5 10604 bytes

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