Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c1495d2121afea…

MALICIOUS

PDF

44.6 KB Created: 2020-08-09 18:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf31d16a563598623be85a82b7863f3f SHA-1: bb528f2e5c666ceb3382c764230af6a6d169efe8 SHA-256: a4c1495d2121afead74cc3616602dfc0f7c34a6c77429a245f9bc9a00842144b
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary URL, https://ttraff.ru/pify?keyword=phaedra+jean+racine+pdf, is likely used to obscure the true malicious destination. The document body itself is heavily obfuscated and contains numerous URLs, reinforcing the finding of a link farm.

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=phaedra+jean+racine+pdf
    • http://files.simeksfarm.com/uploads/1/3/1/4/131454766/a4cc6.pdf
    • http://kalepoxi.studio1039.com/uploads/1/3/1/4/131408899/vavomefigo.pdf
    • http://files.chloejmkim.com/uploads/1/3/1/3/131380345/piteti_lekuvokogadeko_fukipixe_vigaza.pdf
    • http://files.thejesusconversation.org/uploads/1/3/1/8/131856195/2ab05a68ff.pdf
    • http://demeja.christianmindfulness.com/uploads/1/3/2/3/132302780/2602933.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6565103434.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/34533860223.pdf
    • https://cdn.shopify.com/s/files/1/0432/7407/6315/files/bcom_1st_year_books_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0436/5477/4949/files/rohatgi_an_introduction_to_probability_theory_and_mathematical_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4238/files/free_esn_check.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5805/files/57332297903.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0678/files/tidolevugorerutozazak.pdf
    • https://cdn.shopify.com/s/files/1/0438/6983/1323/files/sdgs_agenda_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/83453999275.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/vanaxewaxawixuvipe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuxojusi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/subilotakimevazuru.pdf
    • https://cdn.shopify.com/s/files/1/0440/4133/9045/files/ba_economics_honours_book.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_off000070af.bin
6c83b602f13e2f938a116d86f6e21799094725b70d726a90d673eaf5fa6afcb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AF 5112 bytes
font_01_sfnt_off00008216.bin
5edcb2aa3e760d2fb41c31051bc60668f0b334068b2107ea3486d1cb13ab39e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8216 10228 bytes

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