Malicious PDF — malware analysis report

Static analysis result for SHA-256 400e69d139838a25…

MALICIOUS

PDF

41.8 KB Created: 2020-08-04 05:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc12d1c3cee31f254b8c4f2246ffa3a1 SHA-1: 02a28b855870be9f1fc392ad2a02e7652470485e SHA-256: 400e69d139838a258888439cbb0c20a864eb262ad5b52265e9680ada47e2158a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to domains associated with link farms and redirectors, such as 'ttraff.ru'. The document body, though partially corrupted, contains keywords related to English grammar exercises, likely intended as a lure. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=strona+bierna+angielski+%25C4%2587wiczenia+past+simple+present+simple+pdf', which is flagged as a malicious redirector. The presence of numerous Shopify URLs suggests an attempt to blend malicious links with seemingly benign 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=strona+bierna+angielski+%25C4%2587wiczenia+past+simple+present+simple+pdf
    • http://files.mapleafdals.com/uploads/1/3/1/8/131871583/webetanifixem-nezema.pdf
    • http://files.bobbycarpenterllc.com/uploads/1/3/1/1/131164273/zewow-pobovuvoxi-xizusov.pdf
    • http://files.williammonaguenativeart.com/uploads/1/3/1/3/131398139/6540199.pdf
    • http://files.royaloverload.org/uploads/1/3/2/6/132680974/fivuguxatemifebu.pdf
    • http://files.asproengineering.com/uploads/1/3/2/6/132695832/077f708a6dd.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8374/files/jivasufivekokokipipad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7283/files/5672869267.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/gotiveviwujejigoxatinexev.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/1597199500.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/how_to_install_sevtech_ages.pdf
    • https://cdn.shopify.com/s/files/1/0437/6422/0058/files/fisetawitinetepip.pdf
    • https://cdn.shopify.com/s/files/1/0438/9414/5176/files/35767017490.pdf
    • https://cdn.shopify.com/s/files/1/0433/8860/0478/files/59397735347.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/mubadizoxeremi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/70690381225.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_off00006016.bin
59bd978535e5e4d16b949d7b8ff3af5d982075627dad675b75d9ecdaba49a443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6016 6060 bytes
font_01_sfnt_off00007471.bin
730281c5e861173e0724f5569d5088f49de430e43c734d1a8aab2e4b649bce9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7471 10256 bytes

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