Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba99e2b21f45ded2…

MALICIOUS

PDF

35.9 KB Created: 2020-08-29 06:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fe41b840dd75752a4959a72d33956dc SHA-1: 04ff0e1579f93957ad004773fb8a92a621b31a4a SHA-256: ba99e2b21f45ded20864e0be4c50f146a18887eabdf90b9f95b1ea2dac6ed055
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.cc/wix?keyword=vintage+madame+alexander+dolls+1960%2527+s', points to known malicious redirector infrastructure. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly benign links.

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/wix?keyword=vintage+madame+alexander+dolls+1960%2527+s
    • https://static.usrfiles.com/ugd/b8c837_4890071b2bbf4314940612ace5b2b058.pdf
    • https://static.usrfiles.com/ugd/b8c837_8acb103638da477987d634ea67792e25.pdf
    • https://static.usrfiles.com/ugd/b8c837_292b33e770de484aaf91ce4a74933f5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_083492c2e89a4c3b96d5e0ab96b34c90.pdf
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/disgaea_succubus_class.pdf
    • https://cdn.shopify.com/s/files/1/0433/7565/7121/files/que_es_autoestima_baja.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/48920840983.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/dinixaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/5461/0070/files/conan_exiles_friendly_npcs.pdf
    • https://cdn.shopify.com/s/files/1/0433/5416/1310/files/aleksandr_solzhenitsyn_200_years_together.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/tomb_of_annihilation_companion_free.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_off00004c8d.bin
6e04714ad8eb2f838f7120f8090d6b9076321da23473dd232ff5900a18744c47
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8D 5716 bytes
font_01_sfnt_off00005ff6.bin
d551e754a0ff407da317c7cbe67c3bb66351dcf25d312da4dfa4a6d1ef5fd016
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF6 10260 bytes