Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5faa7176e0a59c1…

MALICIOUS

PDF

46.1 KB Created: 2020-08-19 13:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 165c8eeaa2018f4171b37ddafe7eb498 SHA-1: 0fe20bf7fa26b75bbbf71c3cfdd1ab3454fe1d6a SHA-256: d5faa7176e0a59c1865c4142ec302056c686ec7e95ca586ae78d8bd96bf358cb
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=si+and+cgs+unit+full+form'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many of which are hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a lure to disguise the malicious redirect.

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.cc/pify?keyword=si+and+cgs+unit+full+form
    • http://files.jjsdka.org/uploads/1/3/0/9/130969819/98a098cf.pdf
    • http://files.walshbotanicals.net/uploads/1/3/1/0/131070481/a038e.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/arabesque_1_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/39226471897.pdf
    • https://cdn.shopify.com/s/files/1/0428/5943/0054/files/charismatic_leadership_tactics.pdf
    • https://cdn.shopify.com/s/files/1/0439/2216/1832/files/convert_web_page_to_chrome_extension.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/vavefosavebevivugane.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/12933486175.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/53093159352.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3682/files/jadual_caruman_perkeso.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8504/files/21285451222.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/jonoragoletugididelilo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/paper_rechecking_form_bise_sargodha_2017.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d0.bin
e49d3f5d3dd6f4ba83a1c6a0b406339ebaa5f5fc6b24f4f08bef1b13331c13fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x61D0 5444 bytes
font_01_sfnt_off00007429.bin
8aee139237595961608ddccc7ea3c288785519bf6b49ee3cf62bcd0085efb23b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7429 10164 bytes
font_02_sfnt_off000096d2.bin
2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357
pdf-font-stream PDF embedded font (sfnt) at offset 0x96D2 16060 bytes