Malicious PDF — malware analysis report

Static analysis result for SHA-256 4787ea8b2db791ec…

MALICIOUS

PDF

58.0 KB Created: 2020-08-21 09:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34621b2c50e10f51e957576b463e7aea SHA-1: 3d5606946daccc319b6ed54c307e258c3395c1d9 SHA-256: 4787ea8b2db791eca1363cefcf7afba52fae3c654fcfa1dbdd9cf69c9dadcc9f
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary malicious URL being https://ttraff.com/pify?keyword=free++personal+bio+data+form. This URL is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to trick users into clicking it. The presence of numerous Shopify-hosted PDF links further supports the link farm tactic.

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=free++personal+bio+data+form
    • http://files.kinchastro.com/uploads/1/3/1/4/131408899/vidanuraretokorepex.pdf
    • http://files.daniellerosephotography.com/uploads/1/3/1/4/131437477/nivar-koler.pdf
    • http://zosakeka.serpentinecommunitygarden.org/uploads/1/3/1/6/131636725/4b381d7642.pdf
    • http://files.edgewoodpreschoolcoop.org/uploads/1/3/1/6/131606854/vadozitoru.pdf
    • http://ruvubone.grahamvangoffrier.com/uploads/1/3/1/8/131871592/e861c5123.pdf
    • https://cdn.shopify.com/s/files/1/0438/2277/6480/files/kokino.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8137/files/nawoxowesope.pdf
    • https://cdn.shopify.com/s/files/1/0437/6150/0309/files/71429110453.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/the_best_loved_bear.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/48198739782.pdf
    • https://cdn.shopify.com/s/files/1/0437/3017/4101/files/40392123985.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/zepejisoxezojupejimumos.pdf
    • https://cdn.shopify.com/s/files/1/0437/0068/2906/files/android_studio_emulator_internet_not_working_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/miditomeka.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6566/files/wuxezapor.pdf
    • https://cdn.shopify.com/s/files/1/0437/6841/4370/files/43372242723.pdf
    • https://cdn.shopify.com/s/files/1/0432/9937/3214/files/marriage_biodata_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.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_off00009a32.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A32 2828 bytes
font_01_sfnt_off0000a42c.bin
acd6ea8022db3d4ddfcc47e5d00d8e0e3231fc41228cec0c2ba32e5f15d8389a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA42C 5280 bytes
font_02_sfnt_off0000b5f9.bin
ec4ac453574907588a0950bce2f1b3ebe4aec05eceb9b83f476bc1da79b8844c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F9 9972 bytes

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