Malicious PDF — malware analysis report

Static analysis result for SHA-256 be17c1d0ef9bb713…

MALICIOUS

PDF

41.5 KB Created: 2020-08-20 23:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bbf26881741e33310bce23abcc32cd2 SHA-1: f6007d140fbc14d954b857d58204a63021e00118 SHA-256: be17c1d0ef9bb713373dd6aa76befa45af167cd78c79e90d81d3e2cff9162372
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains the text "Astrology word search answers" and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=astrology+word+search+answers
    • http://files.karilagandancesociety.org/uploads/1/3/0/7/130776809/7153808.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3462/files/22274128112.pdf
    • https://cdn.shopify.com/s/files/1/0432/6588/4323/files/50582971535.pdf
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/14779374677.pdf
    • https://cdn.shopify.com/s/files/1/0434/1081/7180/files/depuy_synthes_products.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/lilobifabesiludokijiban.pdf
    • https://cdn.shopify.com/s/files/1/0459/7071/8887/files/43129369625.pdf
    • https://cdn.shopify.com/s/files/1/0445/5186/4484/files/nobutosuvufodinetipulax.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/42644695530.pdf
    • https://cdn.shopify.com/s/files/1/0431/9284/4448/files/92602052653.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7347/files/arietis_freddie_hubbard.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/80497306625.pdf
    • https://cdn.shopify.com/s/files/1/0429/3420/6620/files/wotok.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_off000063ce.bin
8da5953f2f5430d4ed095409e8329e65aba876023646bee1e82dd98ac8eb418e
pdf-font-stream PDF embedded font (sfnt) at offset 0x63CE 5384 bytes
font_01_sfnt_off00007621.bin
8aa5d4781f1f7ce9bf585a0609a8a5b5abe14bc32e148845959bfdcbc3293168
pdf-font-stream PDF embedded font (sfnt) at offset 0x7621 10408 bytes