Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7892bdbd03b5d8…

MALICIOUS

PDF

50.7 KB Created: 2020-08-22 12:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce3ca74b7626ac5559dc0c4b0fa0a851 SHA-1: 0c4564cabe9bc757e2d0d439362169a1701ee9f8 SHA-256: fc7892bdbd03b5d867d1644ff0569defa8fe4053776c17d5220e14975e8fe1f9
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm behavior, embedding numerous external links, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. These factors suggest the document's primary purpose is to lure users to malicious sites.

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=android+studio+profiler+not+working
    • http://files.lacnyc.org/uploads/1/3/2/7/132740343/bikuxabulosapujixeba.pdf
    • http://files.mcfcconference.com/uploads/1/3/0/9/130969873/tiribofuxex.pdf
    • http://zakajut.faneshafabreart.com/uploads/1/3/1/4/131438641/45dfb.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/58319355310.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6566/files/tonizibepuniz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/voltage_divider_rule_formula.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/52069782013.pdf
    • https://cdn.shopify.com/s/files/1/0435/9618/5763/files/agenda_2020_resumen.pdf
    • https://cdn.shopify.com/s/files/1/0437/6920/0791/files/resedanagegevuremuxemev.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/amiga_1200_manual.pdf
    • https://cdn.shopify.com/s/files/1/0452/4739/8050/files/dejafu.pdf
    • https://cdn.shopify.com/s/files/1/0446/6756/8291/files/cats_in_the_cradle_chords.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/1737829297.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_off00007b1a.bin
22b84e94ed89012939668e98146dfc965a5e90f40e7282225425a10faddf1e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1A 5028 bytes
font_01_sfnt_off00008c57.bin
4030da8cfd73728d2fa95d9c6fc1e0dd86d0e4bfc5733b5143ce4786fb1482f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C57 10364 bytes
font_02_sfnt_off0000afc5.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC5 4324 bytes