Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3571d33031afc47…

MALICIOUS

PDF

32.1 KB Created: 2020-08-17 05:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1693e005352db7da75c8101a4c99dfe5 SHA-1: 6ee3c0ec0f15d6fc18b4ffe8428bc2b3578b2994 SHA-256: a3571d33031afc47cc96e5d6f17f608d94000a8dc64cf43fd84ed791975bb8a6
152 Risk Score

Malware Insights

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

This PDF document contains a mass external link farm, with a primary link directing to a known malicious redirector at https://ttraff.com/pify?keyword=pdf+robotica+industrial. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm and redirector behavior.

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=pdf+robotica+industrial
    • http://files.freakzhub.com/uploads/1/3/1/0/131069819/fadaloso-xomezavifedoxa-dolipenarivakof.pdf
    • http://files.thinktify.com/uploads/1/3/1/4/131438188/3528450.pdf
    • http://files.belmonteestates.org/uploads/1/3/0/7/130775730/fd78e34.pdf
    • http://papon.biologymound.com/uploads/1/3/1/4/131437875/6a37b576fc.pdf
    • http://lajap.boostfitness.co.uk/uploads/1/3/1/4/131406153/tinifugemo_nejivogosugek_vowerakomid_funugudise.pdf
    • https://cdn.shopify.com/s/files/1/0437/4642/7031/files/41800457565.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2699/files/5923259193.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9212/files/imei_check_android_app.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9199/files/amylose_cardiaque_irm.pdf
    • https://cdn.shopify.com/s/files/1/0453/4956/8667/files/bajrang_baan_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/map_of_usa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/sikifofojal.pdf
    • https://cdn.shopify.com/s/files/1/0434/9352/3618/files/organic_chemistry_wade_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/8669/0969/files/922817460.pdf
    • https://cdn.shopify.com/s/files/1/0439/1275/7400/files/98356985613.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_off00004235.bin
69cb130a385b0be16e7c02edd6e1c6685c6e59fc9ab74ef775d6bf5efac6ac1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4235 5156 bytes
font_01_sfnt_off000053c1.bin
4c34219b5d3a0e1d8574f91ad60fcd538744ccb147860fa4b2bf758c33609ea4
pdf-font-stream PDF embedded font (sfnt) at offset 0x53C1 9452 bytes