Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85461a4a75a6a31…

MALICIOUS

PDF

33.7 KB Created: 2020-08-05 08:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2976a1f35227f0e63c97863d1a37a3f SHA-1: 282a41340a150406ddc3750807f598f6c0987e73 SHA-256: c85461a4a75a6a315e4cf6896aa85117f68cc54443ecc50e076bf330abdd49f0
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=wordly+wise+book+8+lesson+11+pdf`. This suggests a social engineering attack aiming to trick users into visiting a potentially harmful site. The document body, though partially corrupted, contains text related to 'Wordly Wise book 8 lesson 11 pdf', likely a lure.

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=wordly+wise+book+8+lesson+11+pdf
    • http://files.seawalkerexcursions.com/uploads/1/3/2/6/132695681/lobotuv.pdf
    • http://tipos.jaxtruebluenfb.org/uploads/1/3/0/7/130775795/53523.pdf
    • http://files.christophertsmith.com/uploads/1/3/2/6/132682471/lotudise.pdf
    • http://jutigor.richescouture.com/uploads/1/3/1/4/131453870/xuwovaveliv_jetulevobal_tijodijebu_ligagegubosuru.pdf
    • https://cdn.shopify.com/s/files/1/0439/4981/8024/files/tabeba.pdf
    • https://cdn.shopify.com/s/files/1/0431/8648/7455/files/communist_anime_girl.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xarapidarobumebavo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7654/9798/files/15924714326.pdf
    • https://cdn.shopify.com/s/files/1/0437/5193/2056/files/wordly_wise_3000_book_3_lesson_7.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4677/files/17634992966.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/jamebabo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4995/7029/files/12971631934.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/bavimadi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/jafub.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/33522729292.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/faden.pdf
    • https://cdn.shopify.com/s/files/1/0431/1996/8417/files/da_form_638.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4801/files/vepopamuxanizem.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_off000046da.bin
d45ff860b7324d7f372404608e55dfb6300d2e9dcac2914912578b53565b5c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46DA 5484 bytes
font_01_sfnt_off000059b6.bin
322b8dd958c079121c1d98f5e8f9fa0835e2214b24a2676ae604ca99d27f650e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B6 9448 bytes

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