Malicious PDF — malware analysis report

Static analysis result for SHA-256 11653a9f3641f06b…

MALICIOUS

PDF

42.4 KB Created: 2020-08-10 22:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 011640c2e0b3371115a2b4998b63d2b0 SHA-1: 651a19b85dcdf6e597b3e4b10ebb0615d1932715 SHA-256: 11653a9f3641f06bfea86186a6a8d95749dc6064838341d978577f6ba293993e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one prominently leading to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though partially corrupted, includes the URL and text suggesting it's a lure for a 'kiran bank po reasoning book pdf'. This indicates an attempt to trick users into visiting a malicious site, likely for phishing or to download further malicious content.

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=kiran+bank+po+reasoning+book+pdf+in+english
    • http://files.teriannescoble.com/uploads/1/3/1/4/131438308/misud.pdf
    • http://files.rovercoveresort.com/uploads/1/3/1/4/131453990/2562555.pdf
    • http://files.nanba-ryu.com/uploads/1/3/0/7/130776542/7c19ab1dd7beee0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/80603662884.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8138/files/hid-_compliant_touch_screen.pdf
    • https://cdn.shopify.com/s/files/1/0431/1678/9927/files/67914013556.pdf
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/72954239862.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/behavioral_economics_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0430/8454/6209/files/58351421049.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/7546923622.pdf
    • https://cdn.shopify.com/s/files/1/0432/6309/9040/files/sudiwepeme.pdf
    • https://cdn.shopify.com/s/files/1/0433/4524/8407/files/alice_in_wonderland_book_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/9462/9788/files/16688384046.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/27519024253.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_off000060c9.bin
1aac4785b49ad5911bcf60c102815dce5936bdce9cc5af078fa839e5acff0039
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C9 5476 bytes
font_01_sfnt_off00007351.bin
0f7549b2b4b933e4ecc3b13037c5f651e96967a944826482eb3e7c6e0011693c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7351 13224 bytes