Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f9fa35141acba0…

MALICIOUS

PDF

41.6 KB Created: 2020-08-13 21:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 095ef892ee628b5eec989647c1eb767c SHA-1: ab2e16538ae19f834bf0b8e56cf37878cb0918d7 SHA-256: 31f9fa35141acba0e35262e51250224ad8b085dbf213db7fa642108a5dd5fae9
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading a 'Mediacom bluetooth usb driver'. This suggests a phishing or social engineering attack aiming to redirect users 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.cc/pify?keyword=mediacom+bluetooth+usb+driver
    • http://nafoves.smartnetworksco.com/uploads/1/3/0/7/130775413/931a74ede38db.pdf
    • http://delakap.bwyouthgolf.com/uploads/1/3/1/0/131070317/xudiropavawo_muzoniwolabepux_katibomaxebes_bewuvajogexe.pdf
    • http://romifetop.mouselab.org/uploads/1/3/0/8/130874601/7708976.pdf
    • http://files.okanagan.com/uploads/1/3/1/4/131438036/94a3b2fef7a1.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/mesepirofigodituw.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9671/files/2319923347.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/advanced_medical_life_support_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/56367853255.pdf
    • https://cdn.shopify.com/s/files/1/0437/9036/8929/files/rexawomodonubidutuxateti.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/wiwetixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/sportsman_1000_watt_inverter_generator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/7279/6325/files/discrete_mathematics_susanna_epp_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/semilexapiwave.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/jonaxojarezo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2119/files/asclepius_product_manual.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_off00005c39.bin
0e0bbfadd6a59e3b9f693cd9df3931ca66b52acbf191e2200372ec91f23b1988
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C39 5384 bytes
font_01_sfnt_off00006e67.bin
443040af727b849cdf83dc62067e9317313231f1f12e0c2c6d24a67b11609c7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E67 13524 bytes