Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b11b510353fa8d…

MALICIOUS

PDF

47.5 KB Created: 2020-08-31 22:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef775e026dd6325bc05b2f50870d8a41 SHA-1: 557b0ccdbea19e9c5b06d639d3c3e2c7547352b6 SHA-256: 39b11b510353fa8df51d865bc7d9397ce03737ee2eea98729161d428ce65d985
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body and embedded links suggest a lure related to movie content to entice users to click. The PDF also hosts a link farm, with many links pointing to Shopify-hosted PDFs, likely to manipulate search engine results.

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/wix?keyword=brick+mansions+2+tamil+dubbed
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/42599368967.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/64415676950.pdf
    • https://cdn.shopify.com/s/files/1/0465/0257/6286/files/72257426305.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7429/files/tixejuxuzifesazulax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2261/3654/files/kobigepibusevoruzebobem.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3380/files/gopejexifisoteka.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8fc5307b7c84764b06b437b970d8ec4.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1340f1607743f594209bed08f197e5.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1418/files/56420789194.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/784133187.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/fasepumud.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/3557587286.pdf
    • https://cdn.shopify.com/s/files/1/0432/9419/5870/files/gozuxifufavubat.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
stream_004_off000067d1.bin
85a70fe67758cc32ab5a573201cb130bf62bfe5d8c490287ce47ebb6a807d1c1
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x67D1 11844 bytes
font_00_sfnt_off00005552.bin
5ac8cfa1b876fe1a72f25170f57851f9d61d47d3a785ce760e2af4b947352987
pdf-font-stream PDF embedded font (sfnt) at offset 0x5552 5472 bytes
font_02_sfnt_off0000874b.bin
ae2cd6dd019cb53f43c8a1219723b464c9ce9ae369812d0b00b6e97bc956ad20
pdf-font-stream PDF embedded font (sfnt) at offset 0x874B 13044 bytes