Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4457501149a5219…

MALICIOUS

PDF

53.1 KB Created: 2020-08-01 08:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f54a58835db3b71364265704b2e19fa9 SHA-1: d6ebdd578a0a3665680ba07a97d99d3c666f331b SHA-256: b4457501149a521959a47c091047be059538d03eb8493dfea8e8cc5fa10863d9
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The document body is heavily obfuscated but contains text related to 'apfs inverter failed to invert the volume' and lists numerous URLs, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. 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=apfs+inverter+failed+to+invert+the+volume
    • http://files.jskennelsandtraining.com/uploads/1/3/1/8/131872055/1628848.pdf
    • http://files.labradoodledelightsoflot16.com/uploads/1/3/0/7/130776855/wiremidorejis.pdf
    • http://files.becomingsarh.com/uploads/1/3/0/7/130739567/3400932.pdf
    • http://files.hardinsburgbc.org/uploads/1/3/2/8/132814343/lewosup.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8910/files/vinowirabogubawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1889/5010/files/savuxuvogonise.pdf
    • https://cdn.shopify.com/s/files/1/0437/2781/4805/files/install_vim_on_raspberry_pi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/folland_real_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/44647428009.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/29656456256.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/rulisoxivexajojalefuri.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/kozowapuwaxuvawisut.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/vodimidimisemobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3021/files/vibigo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48675385277.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/nodutowoniwemovaxodorazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1330/7541/files/kebulet.pdf
    • https://cdn.shopify.com/s/files/1/0430/0954/0257/files/braves_schedule_2020_pdf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079a6.bin
1b99100930de62ad9f84ef96fc6897248fc1d80913e52bd3fbc12e7bfe40cf9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A6 5212 bytes
font_01_sfnt_off00008b2d.bin
c78cd6e3255e348e13d663f5aa0c20b3a4c70051359c76fb1b69649ae545346a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2D 14568 bytes
font_02_sfnt_off0000b8de.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DE 4324 bytes

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