Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f4bb297c7526ec…

MALICIOUS

PDF

56.8 KB Created: 2020-08-14 01:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc0b881b424299f6348a885b5353e1d8 SHA-1: dd903b1205332b8ed1e61c83efd90b8989035ec1 SHA-256: 61f4bb297c7526ec02e9509d2c6a9f40fb9c94fd9259441025c9e161b187583a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL and the link farm heuristic suggest an attempt to lure users to malicious sites, potentially for SEO spam or phishing.

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/wb?keyword=dolor%20abdominal%20funcional%20pediatria%20pdf
    • http://sorud.treestreetturnings.com/uploads/1/3/1/4/131406082/40613753d4582.pdf
    • http://files.needallthis.com/uploads/1/3/2/6/132682327/9547574.pdf
    • http://files.thehollywoodbuilding.com/uploads/1/3/0/7/130775342/5999159.pdf
    • http://betexap.prettystylelife.com/uploads/1/3/2/6/132695584/2148847.pdf
    • http://pufabaj.tidyaire.com/uploads/1/3/0/7/130775164/fatikufakexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5463/6949/files/suziridukujovujivo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/perosabuwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/bertolt_brecht_gedichte.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5156/files/gowezog.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/76480395380.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/37677370652.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/58385385066.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3701/files/uji_one_way_anova_spss.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/71089230657.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2443/files/wipoterotijakodesabod.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/jajewezilav.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/raditenonogexakamozaweses.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009017.bin
81927eff8b52b390961f31c7cd45aeb01fbd15e03adc1596f8ac5d8a3daba6ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9017 5144 bytes
font_01_sfnt_off0000a17a.bin
032a42a84dc1afb142fc88df0f56686461b0948bfb415df127edf34218cbe954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA17A 11020 bytes
font_02_sfnt_off0000c57d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC57D 4324 bytes

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