Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c44a107d03dc636…

MALICIOUS

PDF

42.7 KB Created: 2020-08-13 06:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2e780f0b3b088422e956a60b6d5be8e SHA-1: bc3cd41f23b14576bcca7b13ceb70109b155a130 SHA-256: 1c44a107d03dc63603614fd4e910e5699394e23fe55aa7b69983a84ca5277b18
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.ru), and another noted a large farm of external PDF links, many hosted on cdn.shopify.com. The document body is heavily obfuscated but contains the URL https://ttraff.ru/pify?keyword=adjective+order+pdf, suggesting a lure related to 'adjective order'. The primary attack pattern appears to be SEO manipulation or redirection to malicious content via a link farm.

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.ru/pify?keyword=adjective+order+pdf
    • http://files.familylavisse.com/uploads/1/3/0/7/130776451/gutapemaroz.pdf
    • http://files.huangchensu.com/uploads/1/3/1/6/131637372/843134808f79ea.pdf
    • http://files.reallycassandraradio.com/uploads/1/3/2/6/132696146/7792282.pdf
    • https://cdn.shopify.com/s/files/1/0427/6187/9719/files/binary_options_trading_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0438/2025/3344/files/39205871693.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52209678420.pdf
    • https://cdn.shopify.com/s/files/1/0429/1015/4908/files/kubinefirubotutubuxataxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/15810762055.pdf
    • https://cdn.shopify.com/s/files/1/0450/7284/2915/files/resistance_avalon_rules.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/puleguw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7727/9652/files/army_leave_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/29707787208.pdf
    • https://cdn.shopify.com/s/files/1/0435/5240/7704/files/xenuzudaxataxewe.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_off00005e7b.bin
6503836680b971aafab65127e48d4581a26808f402ccfb814418e07bd74508b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7B 4536 bytes
font_01_sfnt_off00006e01.bin
27b010eb07b8f29d24088e9fb974d5fcc56c7d9b29a8d9f352ffb1afaa081a32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E01 10100 bytes
font_02_sfnt_off00009055.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9055 4324 bytes

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