Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4e4645cf62b397…

MALICIOUS

PDF

62.0 KB Created: 2020-08-06 19:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf5f3e2bb9bb2698fa4dae62db0f1c2d SHA-1: cc56430a015d75dde0d6850aaade9fe7d64638ec SHA-256: 7a4e4645cf62b397581feec3fd0a17d2c6f4b0580cfa8f8a50246302cf7ea65e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious File

The PDF file was identified as malicious due to a high ML classifier score and the presence of numerous embedded links. One critical heuristic indicates a malicious redirector link to 'ttraff.ru', suggesting a phishing or malware distribution attempt. Another heuristic flagged a large PDF link farm, with many links pointing to Shopify-hosted PDFs, indicating a potential SEO manipulation or content distribution scheme.

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=aprender+japones+online+pdf
    • http://lonuweku.bonnergrade1families.com/uploads/1/3/1/6/131606758/07195bdcdbf4.pdf
    • http://wemexado.mrobrien.net/uploads/1/3/0/8/130874218/ketereru.pdf
    • http://files.workshop7l.com/uploads/1/3/0/7/130739101/4323596.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/ganaji.pdf
    • https://cdn.shopify.com/s/files/1/0433/4478/9669/files/vuxeduvor.pdf
    • https://cdn.shopify.com/s/files/1/0431/4637/9426/files/29263335868.pdf
    • https://cdn.shopify.com/s/files/1/0429/1667/5740/files/lodovirubevu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3445/files/alternative_energy_systems_and_applications_hodge.pdf
    • https://cdn.shopify.com/s/files/1/0435/9743/0941/files/781767934.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3854/files/75653536974.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/50843919629.pdf
    • https://cdn.shopify.com/s/files/1/0437/9613/6097/files/keberagaman_budaya_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0430/3935/9127/files/gunobepizugenezi.pdf
    • https://cdn.shopify.com/s/files/1/0450/5151/0936/files/java_8_jdk.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/91537768372.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/sample_gift_letter.pdf
    • https://cdn.shopify.com/s/files/1/0434/4207/7852/files/57240219757.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071e9.bin
d5629a0952a94b1b93070dbbe6dbe27c8adadc834c04ba245ecc495c4f2efe16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E9 17300 bytes
font_01_sfnt_off0000a947.bin
fe2cb749f01f96eded94e171564356a2c8f142a227eb429530bc7860f281e181		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA947 5100 bytes
font_02_sfnt_off0000baab.bin
9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAB 2092 bytes
font_03_sfnt_off0000c44c.bin
8281cd20de9e2ed9eb5abb05c9ce9ea1ea8a4ab2fbfbb128177b73d04682ab91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC44C 11204 bytes

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