Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95aee435202ba78…

MALICIOUS

PDF

37.9 KB Created: 2020-09-01 04:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e68fc7f0298484cb4c5ac092595e4bd4 SHA-1: 749a849cbb904248b0901819a7a20344f161015e SHA-256: e95aee435202ba7868cdc95d56fd24467b12ba365b874fdecc01b4ec471fb104
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=abas-+3+scoring+manual+pdf'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. The presence of a large number of external PDF links, many hosted on shopify.com, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF.

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/wix?keyword=abas-+3+scoring+manual+pdf
    • https://cdn.shopify.com/s/files/1/0432/8561/0654/files/african_american_heritage_hymnal.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/854565116.pdf
    • https://cdn.shopify.com/s/files/1/0435/3222/2615/files/xajas.pdf
    • https://cdn.shopify.com/s/files/1/0437/9767/6192/files/amadeus_itinerary.pdf
    • https://static.usrfiles.com/ugd/b8c837_487fc394f08a44459ad4c0592f0a8814.pdf
    • https://static.usrfiles.com/ugd/963627_db48fdecafd944cbabd311015ef12325.pdf
    • https://static.usrfiles.com/ugd/ae15ca_7f38cd951742450f8391c7daff95800f.pdf
    • https://static.usrfiles.com/ugd/81d6a4_fbe3f1c4ae074057904b81c1a730aac8.pdf
    • https://static.usrfiles.com/ugd/4c1554_2f4e9502b99d4d8682dacc15f0351d55.pdf
    • https://static.usrfiles.com/ugd/5cf23b_5fc1c13078de4edcb1c8ce02b35cb8ba.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2928/files/factoring_polynomials_practice_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9198/files/wegategaxixebunuvajafub.pdf
    • https://cdn.shopify.com/s/files/1/0437/4151/1834/files/40037345219.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/94663879040.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005582.bin
0a96f67685b4dbc82037bb3d860378da7b2529a12bca287a0c8e48e4bbc8c4ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x5582 5800 bytes
font_01_sfnt_off0000692e.bin
77a870c37aeb73313e47f32016e9b9d566ef3d93588eb9191a84ead1e48f94a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x692E 10056 bytes