Malicious PDF — malware analysis report

Static analysis result for SHA-256 982cc1370eacac1f…

MALICIOUS

PDF

42.6 KB Created: 2020-08-25 02:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 259dbf9111e75540e06bcaedfd50a13e SHA-1: 023a761ccf67e8bd82cd8e95a16b7321f31be744 SHA-256: 982cc1370eacac1ff5f201cf043a19d39fee2da361183116f39ea8376093f03c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also flagged as malicious. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of malicious redirector links and 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.com/pify?keyword=forces+worksheet+grade+6+pdf
    • http://files.jkgeography.com/uploads/1/3/2/6/132680932/piludetomigej-kawarukipaxa.pdf
    • http://files.smuckerfarmstn.com/uploads/1/3/0/7/130775735/supujalifufonu-menefapaj.pdf
    • http://bebebijik.talesfromthenursinghome.com/uploads/1/3/0/7/130776617/bijubakejapipenapa.pdf
    • http://nekuju.treherbertbowlsclub.co.uk/uploads/1/3/2/3/132302936/5214994.pdf
    • http://purul.lastresortplayers.com/uploads/1/3/0/7/130775918/zadebupemagexidibu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/21647397644.pdf
    • https://cdn.shopify.com/s/files/1/0430/5489/1161/files/college_algebra_stewart_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4001/files/possessive_adjective_practice.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1236/files/zanizojixujobebikolog.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2201/files/wexelagazeboxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3550/7358/files/3066157093.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3144/files/15403230731.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/ejercicios_rima_asonante_y_consonante.pdf
    • https://cdn.shopify.com/s/files/1/0446/1314/0643/files/catalogue_oriflame_november_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/59687186491.pdf
    • https://cdn.shopify.com/s/files/1/0429/3489/4755/files/53218903106.pdf
    • https://cdn.shopify.com/s/files/1/0432/1955/0370/files/974170938.pdf
    • https://cdn.shopify.com/s/files/1/0440/4104/4118/files/36382694159.pdf
    • https://cdn.shopify.com/s/files/1/0435/6256/5795/files/synchronisatie_agenda_outlook_android.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_off00006727.bin
7ec48ab91f0809041a1076ce1c9e9c88207d4899462dae674adf7b27b77d25e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6727 5652 bytes
font_01_sfnt_off00007a71.bin
b266d47bc375d9784ba822c89d672f29a253e1e0131673205fb8231f12246700		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A71 10344 bytes

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