Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a1ffd1debc92f8…

MALICIOUS

PDF

37.1 KB Created: 2020-08-03 16:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fc98b537206d36882c5dec0cf20e6ed SHA-1: fce1304130ec0e88192acb0eb7c29085245908af SHA-256: 63a1ffd1debc92f8e9c0b9357dcb6ad05a954a80c7ceb29755943109389813cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a redirector service, which in turn leads to a link farm of other PDFs. The primary malicious link is `https://ttraff.com/pify?keyword=air+pollution+engineering+manual+pdf+free+download`, which is designed to trick users into downloading potentially harmful content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a SEO poisoning or link farm attack.

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=air+pollution+engineering+manual+pdf+free+download
    • http://files.ashleyinsurance.net/uploads/1/3/1/3/131379803/zarak-jafiwuv-liroxaririfag.pdf
    • http://files.adhesivetreats.shop/uploads/1/3/2/6/132696263/e18b86e.pdf
    • http://files.grasslaketrafficjamin.com/uploads/1/3/0/7/130738704/ropoxiro_gonuluz_silerelij.pdf
    • http://files.figureitoutct.com/uploads/1/3/2/6/132682030/01760e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/36332813834.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.pdf
    • https://cdn.shopify.com/s/files/1/0429/7064/4631/files/79612483391.pdf
    • https://cdn.shopify.com/s/files/1/0436/8387/2921/files/zeziwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/89554377619.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/50292973202.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/41836943662.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/lubuputediviri.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/wii_roms_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/42737706388.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/79458753002.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f38.bin
634aec779c67c7c17a99ee8410e3608d8e1d7be0e94bd94035b7b007da735933
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F38 5264 bytes
font_01_sfnt_off0000611e.bin
b4158be043092bf6d0bee752d9d5e2c4e6bf4b6aeaa37a0b0e11d535fccbb3df
pdf-font-stream PDF embedded font (sfnt) at offset 0x611E 10608 bytes