Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a08848c4783bc1e…

MALICIOUS

PDF

54.3 KB Created: 2020-08-09 02:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f22fa39b1b7e867f728ddc39a3afa8cd SHA-1: d6082d212d76a6810c220c71a7566feac793460f SHA-256: 2a08848c4783bc1e8e52c866e76d62c728b687d7360aea500ebba15822356470
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to a known malicious redirector. The document body, though heavily obfuscated, also contains the same redirector URL. The presence of numerous links, many pointing to Shopify domains with seemingly random PDF filenames, suggests a link farm designed to distribute malicious content or engage in SEO manipulation for phishing purposes. 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=english+speaking+practice+sentences+pdf
    • http://files.charleswakefieldartist.com/uploads/1/3/2/8/132816066/dapaxifi.pdf
    • http://files.horseshoecafeandcatering.com/uploads/1/3/1/4/131437615/6427351.pdf
    • http://files.liftingthecurtain.net/uploads/1/3/1/4/131411596/mokovokapabinapileju.pdf
    • http://files.fanaticalyankee.com/uploads/1/3/2/7/132740606/b3c19b2ab67.pdf
    • http://sanifelu.wolfemountain.com/uploads/1/3/0/7/130738799/podixomalem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0382/9657/files/lagrange_interpolation_algorithm_python.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0152/files/zivujimitakedo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8170/3319/files/5803476006.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7236632937.pdf
    • https://cdn.shopify.com/s/files/1/0436/9373/6089/files/namojawibomaben.pdf
    • https://cdn.shopify.com/s/files/1/0431/9746/4731/files/xosatuwokuporivi.pdf
    • https://cdn.shopify.com/s/files/1/0450/5174/0310/files/advanced_ms_excel_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/3645/0717/files/case_files_psychiatry_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/beatles_let_it_be_partitura_piano.pdf
    • https://cdn.shopify.com/s/files/1/0433/9187/7283/files/monovokux.pdf
    • https://cdn.shopify.com/s/files/1/0434/9689/8724/files/fulerosilaxanef.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9562/files/memavilugalowuwazonegaz.pdf
    • https://cdn.shopify.com/s/files/1/0452/8252/5345/files/present_perfect_tense_just_already_yet.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_off0000948d.bin
f94f0cfde4010a5ebc60c143d58277b8e6ee737b2c3d45a35125063e6f14746b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x948D 5436 bytes
font_01_sfnt_off0000a70d.bin
6a96a3edda2ce14e41603e66995586c75dcca162f530b857cd96c5318e7d93d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA70D 10696 bytes

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